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is 1 cos 2x sinx
is 1 cos 2x sin 2x
1 cos 2 x sinx
1 cos 2x sinx 2
is 1 cos 2x equal to sin 2x
does 1-cos^2x = sin^2x
what is 1 - cos 2x
結果 : is 1 cos 2x sinx