The value of `sin^3 10^0+sin^3 50^0-sin^3 70^0` is equal to (a)`-3/2` (b) `3/4` (c) `-3/4` (d) `-3/8`

The value of sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) is equal to .

The value of 4 sin A cos ^3 A -4 cos sin^3 A is equal to

The value of cos^2 10^0-cos10^0cos50^0+cos^2 50^0 is equal to 4/3 (b) 1/3 (c) 3/4 (d) 3

The value of 2 sin A cos^(3)A-2 cos A sin^(3)A is …………

The value of sum_(r=0)^(10)cos^3((rpi)/3) is equal to (a) 1/4 (b) 1/8 (c) -1/4 (d) -1/8

Prove that: sin10^0sin30^0sin50^0sin70^0=1/(16)dot

sin x + sin 3x + sin 5x =0

int_(0)^(pi)|cosx|^(3) dx is equal to (a) (4)/(3) (b) (2)/(3) (c) 0 (d) (-8)/(3)

If Aa n dB are acute positive angles satisfying the equations 3sin^2A+2sin^2B=1 and 3sin2A-2sin2B=0, then A+2B is equal to (a) pi (b) pi/2 (c) pi/4 (d) pi/6

Prove that sin3A=3sinA-4sin^3 A