If 4A is an acute angle and ` sec4A = cosec (30° +2A)`. Find A.

If theta is a positive acute angle and 2 costheta=1/2 sectheta ,find the value of theta .

ABC is a right angle triangle right angled at C. If cosec A = sqrt5 . Find the other trigonometrical ratios.

Evaluate sec 50" sin 40° + cos 40" cosec 50° .

If sec 4A=cosec(A-20^@) ,where 4A is an acute angle,find the value of A.

If theta be positive acute angle sin3 theta=cos(2theta+15) ,find the value of theta .

If sec5theta=cosec(theta-36^@) where theta is an acute angle, then find the value of theta .

If tan2A=cot(A-18^@) where 2A is an acute angle,find the value of A.

The value of Sec^4A-Sec^2A is

Find the derivative of y = cosec sqrtx .

If A and B are acute angle such that SinA=CosB then the value of (A+B) is