ABC is a triangle right angled at B and AB:BC=3:4.What is sin A+ sin B+sin C equal to
Consider the following
1.cos A/(1-tan A) + sin A/(1-cot A)=sin A +cos A
2.(1-sin A-cos A)²=2(1-sin A)(1+cos A)
Which of the above identities are correct?
If p=√(1-sin x)/(1+sin x) ,q=(1-sinx)/cos x,r=cos x/(1+sin x),then which of the following is correct?
1.p=q=r
2.p²=qr
Select the correct answer
If tan A+cot A=4 then (tan²)²A+(cot ²)²A is equal to
The angle of elevation of a cloud from a point 200m above the lake is 30° and angle of depression of its reflection in the lake is 60°.
The height of the cloud is
The angles of elevation of the top of a tower from two points P and Q at distances m² and n² respectively,from the base and in the same straight line with it are complementary.The height of the tower is