Verified Answer :

HomertheGenius

y = sin x + sin² x
y = f ( x ) = cos x + 2 sin x cos x
f ( 0 ) = cos 0 + 2 sin 0 cos 0 = 1
The tangent line formula:
y - y0 = f ( x0 ) ( x - x0 )
y - 0 = 1 · ( x - 0 )
Answer:  y = x

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