1) sin8x= 8SinxCosxCox2xCos4x 2) sin^4x + cos^4x = sin^2x(csc^2x-2cos^2x) 3) sin4x/1-cos4x X 1-cos2x/cos2x= tan x 4) sin2x/1+cos2x X cosx/1+cosx= tan x/2 if anyone could prove any of these it will help alot
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Hello, mehadi91kochotmail! I'll do a couple of these for you . . . This one is really goofy . . . On the left side, add and subtract . . . . . . . . . . . . . . Factor: . . . . . For this one, we need more identities: . . Left side: . . . . . .
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