If `A + B + C = 180^@`, then prove that `sin 2 A+ sin 2B + sin 2C = 4 sin A sin B sin C `

sin 2 ………… sin 5

If sin A =cos B , then prove that A+B =90 ^(@)

The solution of the equation sin 2x + sin 4x = 2 sin 3x is

Prove that sin^(2)6x-sin^(2)4x=sin2xsin10x

If A +B + C = pi then secA (cos B cos C - sin B sin C) = .........

For any "Delta"A B C the value of determinant |sin^2\ \ A cot A1sin^2B cot B1sin^2\ \ C cot C1| is equal to- s in A s in B s in C b. 1 c. 0 d. s in A+s in B+s in C

If A= 30° and B = 60°, verify that cos (A+ B) = cos A cos B - sin A sin B.

If a,b,c are in HP, then prove that sin ^(2) ""(A)/(2), sin ^(2) ""(B)/(2), sin ^(2) ""(C )/(2) are also in HP.

In a right angle triangle ABC, right angle is at B ,If tan A=sqrt(3) , then find the value of (i) sin A cos C+ cos A sin C " "(ii) cos A cos C -sin A sin C

Prove that sin(2x)+2sin(4x)+sin(6x)=4cos^(2)xsin4x