Given that tanx = -1/3

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Asked to prove sin2x , cos2x and tan2x

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In a triangle

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Opposite side = -1 and adjcent side = 3 and hypotenuse = a

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According to pythagrerous theroem

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sin2x = 2 sinx cosx

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Therefore the exact values of sin2x and cos2x and tan2x

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