anonymous
  • anonymous
how do i prove this using trig identity: (2sinx+3cosx)^2+(3sinx-2cosx)^2=13
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
i did this on my calculator type it in your calulator just as your type on here tell me what you get
anonymous
  • anonymous
i have to prove it using trigonometric identity without a calculator
anonymous
  • anonymous
First, use foil to expand them. Then use the following identity \[ \sin^2(\theta)+\cos^2(\theta)=1 \]

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anonymous
  • anonymous
what do i do with the leading coefficients?
anonymous
  • anonymous
Factor them out.
anonymous
  • anonymous
What did you get?

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