" 20."sin^(4)x

Solev (sin^(2) 2x+4 sin^(4) x-4 sin^(2) x cos^(2) x)/(4-sin^(2) 2x-4 sin^(2) x)=1/9 .

Solve (sin^(2) 2x+4 sin^(4) x-4 sin^(2) x cos^(2) x)/(4-sin^(2) 2x-4 sin^(2) x)=1/9 .

An incident wave is represented by y(x,t)=20sin(2x-4t) . Write the expression for reflected wave (i) from a rigid boundary (ii) from an open boundary.

The number of distinct solutions of 5/4cos^(2)2x+cos^(4)x+sin^(4)x+cos^(6)x+sin^(6)x=2 is [0,20pi]

sin4x=4sin x cos^(3)x-4cos x sin^(3)x

If 4 sin x.sin 2x.sin 4x = sin 3x then theta =