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Prove that: 1-sin^2x cos*2x/cos^2x = tan^2x + cos^2x
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Prove that: 1-sin^2x cos*2x/cos^2x = tan^2x + cos^2x

Prove that: 1-sin^2x cos*2x/cos^2x = tan^2x + cos^2x-example-1
User David Siegel
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LHS = (1-sin² cos²)/(cos²)

= (sin² + cos² - sin² cos²)/(cos²)

= (sin/cos)² + 1 - sin²

= tan² + cos²

= RHS

User Mittenchops
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