`sin 163^0cos 347^0+sin 73^0sin 167^0=` a.`1//2` b. `1` c. `0` d. none of these

The value of sin 78^0-sin 66^0-sin 42^0+sin6^0 is a. -1 b. 1//2 c. -1//2 d. none of these

(lim)_(x->0)(|sin x|)/x is a. 1 b . -1 c. 0 d. none of these

Prove that: sin6^0sin42^0sin 66^0sin 78^0=1/(16)

Prove that sin6^0sin42^0sin66^0sin78^0=1/(16)

Prove that: sin 23^0+sin 37^0=cos7^0

Prove that: cos510^0cos 330^0+sin 390^0cos 120^0=-1.

The average value of sin2^@,sin4^@, sin6^@.........sin180^@ is (i) 1/90 cos1^0 (ii) 1/90 sin1^0 (iii) 1/90cot1^0 (iv) none of these

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

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

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