Suggested: cos2x-1/cosx-1 - cos2x= 1-tan2x/1+tan2x - cos2x/1+sin2x=tan(pi/4-x) - cos2x=1-2sin^2x - cos2x=1 - cos2x=1/2 - sin8x-cos8x=(sin2x-cos2x)(1-2sin2x cos2x) - 1-cos2x/1+cos2x integration - sin2x+cos2x=1 proof - cosx-cos2x/1-cosx integration - 1/cos2x(1-tanx)^2 - 1+sin2x-cos2x/1+sin2x+cos2x=tan x - prove cos2x=1-tan^2x/1+tan^2x - cosx-cos2x/1-cosx differentiation - cos2x(1 Browse related:
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