Question

If sin3A=cos(A-10°).Find A

Answer 1

$\sin(3a) = \cos( a - 10) \\ \sin(3a) = \sin( \frac{\pi}{2} - (a - 10) ) \\ compare \\ 3a = \frac{\pi}{2} - a + 10 \\ 4a = \frac{\pi}{2} + 10 \\ a = \frac{\pi + 20}{8}$

mark as brainliest if helped