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9 March, 14:51

If sinx=2cosx then, what is the value of sin2x?

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  1. 9 March, 14:59
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    sin (x) = 2cos (x)

    tan (x) = 2

    tan⁻¹[tan (x) ] = tan⁻¹ (2)

    x ≈ 63.4

    sin (2x) = sin[2 (63.4) ]

    sin (2x) = sin (126.8)

    sin (2x) ≈ 0.801
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