cos^2 75°+cos^2 15°=cos^2 75°+ sin^2 75°=1
cos75°+cos15°=2 cos 45°cos30°=根號(hào)6 /2
兩個(gè)加
結(jié)果就是1 + 2分之1的根號(hào)6
cos^2 75°+cos^2 15°+cos75°+cos15°
cos^2 75°+cos^2 15°+cos75°+cos15°
數(shù)學(xué)人氣：728 ℃時(shí)間：2020-06-24 07:48:30
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