1+sin2x = (sinx + cosx)²
1+sin2x = sin²x + 2•sinx•cosx + cox²x
1+sin2x = (sin²x + cos²x) + 2•sinx•cosx
1+sin2x = 1 + sin2x
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1+sin2x = (sinx + cosx)²
1+sin2x = sin²x + 2•sinx•cosx + cox²x
1+sin2x = (sin²x + cos²x) + 2•sinx•cosx
1+sin2x = 1 + sin2x