Question

Find " sin^75°-sin^15° "​

Answer 1

Answer:

$\sin( \theta) = \cos(90 - \theta) \\ so \\ \sin(75) = \cos(90 - 75) \\ = \cos(15) \\ then \\ \sin(75) - \cos(15) \\ = \cos(15) - \cos(15) = 0$