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OpenStudy (anonymous):
Which of the following is an identity? A. secx tanx - cosx cotx = sinx B. cosx(2sinx + 1) = 0 C. (tanx + cotx)(sinx cosx) = 1 D. sin2x = 4 - 2cos2x
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OpenStudy (anonymous):
I think B but I'm probably wrong.
OpenStudy (anonymous):
B is incorrect.
OpenStudy (anonymous):
is it D
OpenStudy (anonymous):
No, It is C. Now, prove that C is an identity.
OpenStudy (anonymous):
thanks
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OpenStudy (anonymous):
ok
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