trig equations involving 2A
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Original post by apronedsamurai
Im confused.
How does cos^2x + sin^2x = 1?
cos^2 alpha-sin^2 alpha= cos2alpha
is different from cos^2A+sin^2A=1
How does cos^2x + sin^2x = 1?
cos^2 alpha-sin^2 alpha= cos2alpha
is different from cos^2A+sin^2A=1
Both are true
I am not sure what order you are doing your study but one of the first trigonometric identities that people learn is that cos squared alpha plus sin squared alpha equals 1
cos^2x + sin^2x = 1
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