Question

Please help! Find: sin15degrees (using 45degrees and 30degrees)
a. sin 45° cos 30° - cos 45° sin 30°
b. cos 45° cos 30° + sin 45° sin 30°
c. cos 45° cos 30° - sin 45° sin 30°
d. sin 45° cos 30° + cos 45° sin 30°

Answer 1

sin 15 = sin ( 45-30)
Identity: sin(a-b) = sina cosb - cosa sinb

Answer 2

a. THANKS!