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OpenStudy (anonymous):
Which of the following is an identity? A. tan^2x + cot^2x = 1 B. (1 - 2sin^2x)csc^2x = 4cos^2x - 2 C. sinx - cosx + 1 = tanx D. sin^2x cot^2x + cos^2x tan^2x = 1
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OpenStudy (anonymous):
D
OpenStudy (anonymous):
http://www.wolframalpha.com/input/?i=sin^2x+cot^2x+%2B+cos^2x+tan^2x+%3D+1 See where it says "True"...
OpenStudy (anonymous):
that means its an identity?
OpenStudy (anonymous):
Yup...
OpenStudy (anonymous):
thanks
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