Question

calculate the value of : sin ^2 15° + sin ^2 645°.
(a).1/2.
(b).1
(c).1/√3.
(d). none of these.​

Answer 1

Answer:

b. 1

Explanation:

sin 645° = sin(2 x 360° - 75°) = -sin 75°

-sin 75° = -sin(90°-15°) = -cos 15°

sin²15°+(-cos 15°)²

∴ sin²15°+cos²15° = 1

Answer 2

Answer:

option B is correct ❣️❣️❣️❣️❣️❣️❣️