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Posted by on Monday, March 5, 2012 at 8:02pm.

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

  • Trig - , Monday, March 5, 2012 at 8:11pm

    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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