Question

Question #c12a4

Answer 1

see expanation below

Explanation:

Let we take LHS to prove RHS.

`2 sin (3.14/4 -x/2) cos (3.14/4 - x/2) = sin((3.14/4 -x/2)+(3.14/4 -x/2))`

`= sin((pi/4 -x/2)+(pi/4 -x/2))` where `3.14 = pi`

= `sin( pi/2 - x) = cos x`,