sin75度等于几分之几
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sin75度等于几分之几
sin75度等于几分之几
sin75度等于几分之几
sin75°=sin(45°+30°)
=sin45°cos30°+sin30°cos45°
=√2/2·√3/2+1/2·√2/2
=√6/4+√2/4
=(√6+√2)/4
sin(45º+30º)
=sin45cos30+sin30cos45
=√2/2×√3/2+1/2×√2/2
=√2/2(√3/2+1/2)
=(√6+√2)/4
sin75度等于几分之几
sin75度等于几分之几
sin75度等于多少
sin75度等于多少?
sin75度等于多少?
sin75度等于?
(1)根号3乘以2分之根号2除以2分之根号3等于根号几 (2)根号3乘以sin75°除以2分之根号(1)根号3乘以2分之根号2除以2分之根号3等于根号几(2)根号3乘以sin75°除以2分之根号3等于根号几
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