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Trig

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Prove (3cosθ-4sinθ)^2+(4cosθ+3sinθ)^2=25

  • Trig -

    square both terms...

    9cos^2+4sin^2-24cossin+16cos^2+24cossin+9sin^2=

    9(cos^2+sin^2)+16(cos^2+sin^2)=
    and you can finish it.

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