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sabika13

  • 2 years ago

how do i prove this using trig identity: (2sinx+3cosx)^2+(3sinx-2cosx)^2=13

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  1. jennyjewell25
    • 2 years ago
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    i did this on my calculator type it in your calulator just as your type on here tell me what you get

  2. sabika13
    • 2 years ago
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    i have to prove it using trigonometric identity without a calculator

  3. wio
    • 2 years ago
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    First, use foil to expand them. Then use the following identity \[ \sin^2(\theta)+\cos^2(\theta)=1 \]

  4. sabika13
    • 2 years ago
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    what do i do with the leading coefficients?

  5. wio
    • 2 years ago
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    Factor them out.

  6. wio
    • 2 years ago
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    What did you get?

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