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7 May, 14:23

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

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  1. 7 May, 17:23
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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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