Photos Y 12 COS X

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Y 12 cos x. Sin2x+cos2x=0. 4cos^2 2x 8 cos^2x=7 @x<4. Cos (x/2 + п/4)<1/2. 16sin 4 х +8cos2x-7.
Sin2x+cos2x=0. 4cos^2 2x 8 cos^2x=7 @x<4. Cos (x/2 + п/4)<1/2. 16sin 4 х +8cos2x-7.

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