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Thread: N4 Examination Trigonometry

  1. December 9th 2012, 08:51 AM #1
    chris541125
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    Unhappy N4 Examination Trigonometry

    Can someone please help with the following:
    proof that
    2sinx+1/sin2x+cosx=secx
    Thank you
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  2. December 9th 2012, 09:51 AM #2
    skeeter
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    Re: N4 Examination Trigonometry

    post trig problems in the trig forum, please.
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  3. December 9th 2012, 09:58 AM #3
    Soroban
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    Re: N4 Examination Trigonometry

    Hello, chris541125!

    I had to guess what the problem said . . .

    Prove: . \frac{2\sin x+1}{\sin2x+\cos x}\:=\:\sec x

    Identity: . \sin2x \:=\:2\sin x\cos x

    The left side is: . \frac{2\sin x + 1}{2\sin x\cos x + \cos x} \;=\; \frac{2\sin x + 1}{\cos x(2\sin x + 1)} \;=\;\frac{1}{\cos x} \;=\;\sec x
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