(sin15°+cos15°)(sin15°-cos15°)的值为?

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(sin15°+cos15°)(sin15°-cos15°)的值为?(sin15°+cos15°)(sin15°-cos15°)的值为?(sin15°+cos15°)(sin15°-cos15°)的值

(sin15°+cos15°)(sin15°-cos15°)的值为?
(sin15°+cos15°)(sin15°-cos15°)的值为?

(sin15°+cos15°)(sin15°-cos15°)的值为?
原式=sin15^2-cos15^2=1-2*cos15^2=-cos30=-√3/2

(负的根号下3)/2