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OpenStudy (anonymous):
Prove this identity: (sec x+1)^2-(sec x-1)^2=4tanx/sinx
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OpenStudy (mertsj):
Square both binomials, remove the parentheses and collect the like terms.
OpenStudy (anonymous):
I did that. Got 4secx=4tanx/sinx What do you do from here?
OpenStudy (mertsj):
Change 4secx to 4/cosx. Now go to the right side. Replace tan with sin/cos and simplify the complex fraction.
OpenStudy (anonymous):
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