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Trig Identities s&d
Sum & difference & double angle identities
Question | Answer |
---|---|
sin2x | 2sinxcosx |
sin(x+y) | sinxcosy + sinycosx |
cos(x+y) | cosxcosy - sinxsiny |
cos(x-y) | cosxcosy + sinxsiny |
sin(x-y) | sinxcosy - sinycosx |
cos2x | = cos^2x-sin^2x = 2cos^2x-1 = 1-2sin^2x |