Question 204696
1)Prove the following identities.
a) sinx cosx/tanx=1-sin^2 x
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(sinx)(cosx)/[(sinx/cosx)] =  cos^2 x

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Invert the denominator and multiply to get:
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(sinx)(cosx)[cosx/sinx] = cos^2x
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Cancel on the left side to get:
cos^2x = cos^2
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Cheers,
Stan H.