Represent the graph of f(x) =5sin[2(x+45°)] with an equation using a cosine function????

Answer 1

f(x) = 5sin[2(x + 45°)]
f(x) = 5cos[90° - 2(x + 45°)]
f(x) = 5cos(-2x)
f(x) = 5cos(2x)

Answer 2

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sin ( 2x + 90 )° = sin 2x cos 90° + + cos 2x sin 90 ° = cos 2x
f (x) = cos 2x°