How do you express #cos( (3 pi)/ 2 ) * cos (( 13 pi) / 8 ) # without using products of trigonometric functions?
2 Answers
Mar 27, 2016
Answer is
Explanation:
We know
and
Adding two we get
Hence
=
=
=
=
Mar 27, 2016
Zero
Explanation:
Trig table -->