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Questions  

If sin2(x+π/4)+3cos2x>0, then

a
cos⁡(2x−π/6)>−1/2
b
sin⁡(2x−π/6)<−1/2
c
sin⁡(2x−π/6)>−1/2
d
cos⁡(2x−π/6)<−1/2

detailed solution

Correct option is A

2sin2⁡(x+π/4)+3cos⁡2x>0⇒1−cos⁡(2x+π/2)+3cos⁡2x>0⇒12sin⁡2x+32cos⁡2x>−12⇒cos⁡(2x−π/6)>−12

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