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

If  (3-tan²A)/(1-3tan²A)=K whre K is a real number,then cosec A(3sin A-4sin³A) is equal to

If cos A=tan B,cos B=tan C,cos C=tan A,then sin A is equal to