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OpenStudy (anonymous):
prove that (cosx+cosy)2+(sinx+siny)2=4cos2 x-y/2
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OpenStudy (anonymous):
does the 2 after the brackets mean squared?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
Try expanding and substituting the trigonometric functions
OpenStudy (anonymous):
ok - ill write cx for cos x and sx for sin x yes its worth doing that agd...
OpenStudy (anonymous):
ok
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OpenStudy (anonymous):
sorry - gotta go
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