Question

If (sin2A+45)=cos(30-A),find A

Answer 1

Answer:

$sin(2a+ 45) = cos(30 - a) \\ \\ \\ = > sin(2a + 45) = sin(90 - (30 - a)) \\ \\ = > 2a + 45 = 60 + a \\ \\ \\ = > 2a - a = 60 - 45 \\ \\ \\ = > a = 15$

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