The graph of sin function is a curve as shown below:
Now, Sin 2Ф , where Ф = [tex] \frac{ \pi } {4} [/tex]
or sin 2Ф = 2 × [tex] \frac{ \pi } {4} [/tex]
or sin 2Ф = [tex] \frac{ \pi } {2} [/tex]
Ans, sin π/2 = sin 180/2 = sin 90 = 1
Thus, the curve has maximum at 90.
