If `A and B` are positive acute angles and `cos A = 1/7, cos B = 13/14`, then show that `A-B=60^0`.

If /_A and /_B are acute angles such that cos A=cos B . then show that /_A=/_B .

If /_A and /_B are acute angles such that cos A=cos B . then show that /_A=/_B .

In sinA=sinB and cos A=cos B , then prove that sin((A-B)/2)=0

If A and B are acute angles such that tanA=cotB , then show that A+B =90^(@) .

If A and B are acute angles, find (A+B) given sin A = (1)/(sqrt5) , sin B = (1)/(sqrt10)

If a=s e ctheta-t a ntheta and b=cos e ctheta+cottheta , then show that a b+a-b+1=0.

A and B are positive acute angles satisfying the equations 3cos^(2)A+2cos^(2)B=4 and (3sinA)/(sinB)=(2cosB)/(cosA) , then A+2B is equal to (a) pi/4 (b) pi/3 (c) pi/6 (d) pi/2

If theta is a positive acute angle such that sectheta=cos e c\ 60o , find the value of 2cos^2theta-1 .

if A+ B + C = pi, and cos A = cos B cos C, show that 2 cot B cot C=1.

If A and B are complementary angles, prove that : cot B + cos B = sec A cos B (1 + sin B)