In Exercises 1214, verify the identity. 12. cot2 (sec2 1) = 1 13. sin(x + y) sin(x y) =
Chapter 5, Problem 12(choose chapter or problem)
In Exercises 12–14, verify the identity.
\(\cot ^{2} \alpha\left(\sec ^{2} \alpha-1\right)=1\)
Text Transcription:
cot^{2} alpha(sec^{2} alpha-1)=1
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