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Introduction to Trigonometric Identities
12. Trigonometric Identities / Introduction to Trigonometric Identities / Problem 1
Problem 1

Is the given equation an identity?
cot2xcos2x=cot2x+sin2x1\(\cot\)^2x\(\cos\)^2x=\(\cot\)^2x+\(\sin\)^2x-1