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Mathematics 9 Online
OpenStudy (anonymous):

prove that (cosx+cosy)2+(sinx+siny)2=4cos2 x-y/2

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

OpenStudy (anonymous):

sorry - gotta go

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