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  • 26-03-2014
  • Mathematics
Answered

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

Verified Answer :

Anonymous Anonymous
  • 28-03-2014

\(\vdots\ sin^2\theta+cos^2\theta=1\to cos^2\theta=1-sin^2\theta\ \vdots\\\\\\cos^2\theta-sin^2\theta=1-2sin^2\theta\\\\L=\underbrace{1-sin^2\theta}_{cos^2\theta}-sin^2\theta=1-2sin^2\theta=R\\\\L=R\)

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