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Mathematics 7 Online
OpenStudy (anonymous):

Verify the identity.

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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