How do you express cos( (3 pi)/ 2 ) * cos (( 5 pi) /4 ) cos(3π2)⋅cos(5π4) without using products of trigonometric functions?
2 Answers
0
Explanation:
From knowledge of the graph of cosx , we know that
cos((3pi)/2) = 0cos(3π2)=0 and
cos((5pi)/4) = -cos(pi/4) = -1/sqrt2 cos(5π4)=−cos(π4)=−1√2
rArr cos((3pi)/2) . cos((5pi)/4) = 0.(-1/sqrt2) = 0 ⇒cos(3π2).cos(5π4)=0.(−1√2)=0
It is equivalent to
Explanation:
To express
Although,