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OpenStudy (anonymous):
Verify the identity.
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OpenStudy (anonymous):
OpenStudy (sidsiddhartha):
u know cos(a+b)=cosa*cosb-sina*sinb now put b=a u'll get cos2a=cos^2a-sin^2a use this property
OpenStudy (anonymous):
i have no idea
OpenStudy (sidsiddhartha):
if u dont know this basic formulas u wont be able to solve further
OpenStudy (anonymous):
ok
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