How do you express #cos(pi/ 3 ) * sin( ( 5 pi) / 8 ) # without using products of trigonometric functions?
2 Answers
It may be "cheating", but I would just substitute
Explanation:
You're probably supposed to use the identity
Put in
Then
where in the last line we use
As you can see, this is unwieldy compared with just putting in
Explanation:
Trig table -->
Trig unit circle and property of complementary arcs -->
P can be expressed as:
NOTE. We can evaluate