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Below is a list of 5 identities that can be verified in more than one way. Choose one identity from the list and verify it.
Below is a list of 5 identities that can be verified in more than one way. Choose one identity from the list and verify it.
1. cos(x)+cos(y)=2cos(x+y/2)cos(x-y/2)
2. sin(2theta)=2(sintheta*costheta)
3. 1 + tan^2(x) = sec^2(x)
4. sin(x+y)=sin(x)cos(x)=cos(x)sin(y)
5. cos(x/2) = root1+cos(x)/2
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