Verifying trig identity :cos to the second power theta minus sin to the second power theta equals 1 minus 2 sin to the second power theta

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26-03-2014
Mathematics

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Verifying trig identity :cos to the second power theta minus sin to the second power theta equals 1 minus 2 sin to the second power theta

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Анонимidn Анонимidn · Answer 1 · 2014-03-28T18:21:22-04:00

Анонимidn Анонимidn

28-03-2014

[tex]\vdots\ sin^2\theta+cos^2\theta=1\to cos^2\theta=1-sin^2\theta\ \vdots\\\\\\cos^2\theta-sin^2\theta=1-2sin^2\theta\\\\L=\underbrace{1-sin^2\theta}_{cos^2\theta}-sin^2\theta=1-2sin^2\theta=R\\\\L=R[/tex]

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