Students and Teachers Forum
L.H.S. = cos2θ = 2cos2θ - 1 Put the value of cosθ from the .....
L.H.S. = cos2θ = 1 - 2sin2θ Put the value of sinθ given in the .....
Use the formula, sin3θ = 3sinθ - 4sin3θ cos3θ = 4cos3θ - 3cosθ tan3θ = 3tanθ - tan3θ/ 1- .....
L.H.S.= (1+ tanA)2 + (1- tanA)2 = 1 + 2tanA + tan2A + 1 - 2tanA + tan2A = 2 + 2tan2A = 2(1 + tan2A) .....
Neighbourhood means the people who live near you. Now tell me the name of your friends who live near your .....
L.H.S.= (xcosA + ysinA)2 + (xsinA - ycosA)2 = x2cos2A + 2xycosAsinA + y2sin2A + x2sin2A - 2xysinAcosA + y2cos2A = x2cos2A + x2sin2A + y2sin2A + .....
a. - iii) trowel b.- iv) spade c. - i) saw d. - v) sickle e. - ii) .....
Let the two numbers be x and y, where x > y. By question, x/5 = y/6 + 4 ---------- (i) x/2 + y/4 = 38 --------- (ii) Substitute the value from the above equation and hence find the value of x and .....
Let the two numbers be x and y. By question, x + y = 47--------(i) x = 4y + 2---------(ii) Substitute the value of x from equation (ii) to equation (i) and solve for y and .....
Great wall of china is the longest wall in the .....
The sun is a star. It is the star round which the earth and other planets revolve. In a way, we can say that sun is the head of solar family or solar system. Compared with the millions of other stars, the sun is a medium sized star and of average .....
I eat Mo: Mo, don't .....
We can make people aware of social evils and problems differently. The people who are illiterate need more time while counseling. On the other hand, the ones who are literate can understand things easily. The awareness program on drug abuse .....
The author of the book 'Phool ko Atanka' is Dhurba Chandra .....
Magnesium + Nitrogen → Magnesium Nitride Using appropriate symbols this reaction can be written as Mg + N2 → Mg3N2 Is numbers of elements of both sides equal? Number of .....
There is nobody. Check the question and post it again? Well, let me ask you a question. Who is the person in the .....
Nose is one of the five sense organs. The other are eye, tongue, ear, and skin. Nose is used to smell. With the help our nose, we find something smelling good or .....
Hydrogen plus chlorine gives hydrogen chloride. This reaction can be written as H2 + Cl2→ 2 H Cl Is this reaction balanced? Count the number of hydrogen and chlorine in both side. Is some correction needed to make .....
Venus is known as hotest planet because of the following reasons: The atmosphere of Venus is very hot and thick. The atmosphere of Venus is made up mainly of carbon dioxide, and thick clouds of sulfuric acid completely cover the .....
Measuring the volume requires different techniques. It depends on shape of object. If an object has regular shape, we can measure volume by using formula. For example, if you have to measure volume of a cube, you can measure the length of a .....
In LHS , use the relation sec2 A = 1 + tan2 A you will get the .....
Do you know air contains water vapour also. Although major constituents of air is nitrogen and oxygen, there is also significant amount of water also. The amount of water vapour present in air is known as .....
Yes, we use much and many for positive sentence. I have much money. I have many .....
The number of muscles in the human body varies from around 640 to .....
Tracheophyta have well developed vascular system right? Do fern and cycus have well developed vascular system? Yes they have. That's why they are moved to phylum .....
Many times you have seen that we celebrate the happy moment with our neighbour. You celebrate moments like the birth of a new child, marriage and many happy moments of our neighbour. You may also have celebrated their festivals even if their .....
The stigma is a sticky tip on the top of a carpel. The major function of the stigma in a flower plant is as a pollen receptor. It acts as a good .....
For regular object you can measure area by using formula. For example, area of rectangular object can be found by multiplying length and breadth. We have formulae to calculate area of all regular objects. For irregular object we can measure .....
Types of Forces: 1.Contact Force : Contact Force Forces which act on a body either directly or through a medium are called contact forces. The examples of contact forces are a Muscular force, mechanical force and Frictional .....
Wastes are unwanted or unused materials. We generate a huge amount of wastes in our everyday life. Some of the common sources of waste are: 1.Municipal sources of wastes: These include trash or garbage from households, .....
The causes of water pollution are as follows: 1. Disposal of sewage into the sources of water. 2. Throwing of dead animals and other waste materials into the water. 3. Washing vehicles and bathing cattle in streams and rivers. 4. Throwing .....
The things that are made by man are called man-made things. The five man-made things are : i) Desk ii) House iii)Car iv) Computer v) .....
Art is the expression of creative mind. It not only reflects the creativity of the artist but also environment and situations where the artist lives. So it has a reflection of the overall lifestyle of the contemporary society. Some of the .....
People first sent a dog named Laika in space to figure out whether or not it is possible to travel in the space safely and return back earth unharmed. And also to know about the effect of .....
The community where I live is in remote area of Nepal. The problems like poverty, unemployment, corruption etc. are everywhere there. These problems have broken the social harmony. Therefore, the following things should be considered while .....