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    Verfiy the identity cotx - sin2x = cotx cos2x

    I'm struggling to convert -sin2x to something meaningful and understand it! Can someone help please?

    Thanks
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    (Original post by bekamop99)
    Verfiy the identity cotx - sin2x = cotx cos2x

    I'm struggling to convert -sin2x to something meaningful and understand it! Can someone help please?

    Thanks
    Sin2x = 2sinxcosx

    If in doubt about trig, turn everything into sin or cos.
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    (Original post by SeanFM)
    Sin2x = 2sinxcosx

    If in doubt about trig, turn everything into sin or cos.
    Thanks, I did that. Then what?
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    (Original post by bekamop99)
    Thanks, I did that. Then what?
    I would change the cot x into what that means, in terms of sin and cos. Then I would look at where I want to end up, and see that it is cot x times something, so I would factorise out the cot x (or the re-written version) and see what I am left with.
 
 
 
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