3 years ago

Prove cos(^2)x-sin(^2)x=1-2sin(^2)x

Mathematics

1 answer:

aleksley [76]3 years ago

4 0

Answer:

Step-by-step explanation:

$cos^2x-sin^2x=1\\\\cos^2x+sin^2x=1\\\\so~cos^2x=1-sin^2x\\cos^2x-sin^2x=1-sin^2x-sin^2x=1-2sin^2x$

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$\bold{METHOD\ 1}$

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