Simplify the expression: (sinx + cosx)2.
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Correct answer: D
Explanation
Has been given :
(sinx + cosx)²
According to the formula:
(a + b)² = a² + b² + 2ab
sin²x + cos²x = 1
(sinx + cosx)²
= sin²x + cos²x + 2sinx cosx
= 1 + 2 sinx cosx