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Asked by Tyler

Establish the following identity

sin 2x/sinx - cos2x/cosx = secx
15 years ago

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Answered by Reiny
Use sin 2x = 2sinxcosx and
cos 2x = 2cos^2x - 1
in the left side, it comes apart nicely
15 years ago
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Establish the following identity

sin 2x/sinx - cos2x/cosx = secx

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