sin105°＝?sin75°＝?sin15°＝?
sin105°＝?sin75°＝?sin15°＝?
數(shù)學(xué)人氣：950 ℃時間：2020-04-12 02:25:18
優(yōu)質(zhì)解答
sin105°= sin（45°+60°）= sin45°cos60°+cos45°sin60°= √2/2*½+√2/2*√3/2= √2/4+√6/4= （√2+√6）/4sin75°= sin（45°+30°）= sin45°cos30°+cos45°sin30°= √2/2*√3/2+√2/2*½= （√2...
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