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maths please answer NOW!!!!!

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solve algebreically the equation

also cosx=cosx-1

and please also sin2x=3sinx

  • maths please answer NOW!!!!! -

    Isn't cos2x=cos^2x-sin^2x=1-2sin^2 x ?
    put that into the left side, gather terms, and you have a quadratic equation.

    The second makes no sense.

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