How would I prove an Identity like the cos(2x)=1-2(sinx)^2 or something like sin(2x)=2sinx*cosx. I don't really know how to get started
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How would I prove an Identity like the cos(2x)=1-2(sinx)^2 or something like sin(2x)=2sinx*cosx. I don't really know how to get started
To proveuse the addition formula for sine.
Then, we can write
and get:
See there?
To prove
Easier than you thought, huh?
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