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If a = cos 2 and b = sin 7, then

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a>0, b >0

ab <0

a>b

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detailed solution

Correct option is B

we have,π2<2c<3π4and 2π<7c<5π2⇒ 2cis in second quadrant and 7cis in first quadrant⇒ a=cos⁡2c<0 and b=sin⁡7c>0⇒ ab<0

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