How do you express sin(π4)⋅sin(9π8) without using products of trigonometric functions?
1 Answer
Apr 24, 2016
Explanation:
Trig table -->
sin ((9pi)/8) = sin (pi/8 + pi) = -sin (pi/8)
Therefor, the product P can be expressed as:
Note.
We can find P, by evaluation