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OpenStudy (anonymous):
Prove the Identity cos3x = 4cos3x −3cosx
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OpenStudy (superdavesuper):
U can use the following eqn: cos(A+B)=cosAcosB-sinAsinB to expand cos3x....
OpenStudy (superdavesuper):
wait a moment plz.....is the Q actually asking u to solve for x? or it is asking u to prove the above eqn??
OpenStudy (anonymous):
Prove the equation
OpenStudy (anonymous):
equation is not true for all real numbers...
OpenStudy (superdavesuper):
@purger agreed! @nerdgirl2013 sorry, either the Q is wrong or we are missing something here.
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OpenStudy (anonymous):
the hint: how else could cos3x be written? the equation is (4cos^3x) not 4cos3x the 3 is a power
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