anonymous
  • anonymous
Write as a single trig function: cos²3M-sin²3M
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
i have no idea why this equals cos(3M)
anonymous
  • anonymous
is there any identity related to this?
anonymous
  • anonymous
cos^2(3M) = 1-sin^2(3M). So, you can substitute and write it in terms of sin.

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anonymous
  • anonymous
wouldn't that equal 1 then? cos²3M-sin²3M = 1-sin²3M-sin²3M = 1?
anonymous
  • anonymous
No, it will be 1-2*sin^2(3M).
anonymous
  • anonymous
oh my mistake. thank you!

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