Cos(a-b) Sin a =3/5 Cos b = 12/13 A is in quadrant 2 B is in quadrant 4 Exact value pls

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A: Area of the sector

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A: We use Trigonometry identities to solve this Question

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A: Note that we have to show that the integral value is  π2(1 - cosα).

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A: In third quadrant tangent and cotangent are positive.