sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?1题:sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?2题:已知∠A是锐角,cosA=5分之3,求sinA,tanA?
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![sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?1题:sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?2题:已知∠A是锐角,cosA=5分之3,求sinA,tanA?](/uploads/image/z/960781-13-1.jpg?t=sin45%C2%B0-cos60%C2%B0%2Btan60%C2%B0%3D%3Fcos%26%23178%3B30%C2%B0%2Bsin%26%23178%3B30%C2%B0-tan45%C2%B0%3D%3Fsin30%C2%B0-tan30%C2%B0%2Bcos45%C2%B0%3D%3F1%E9%A2%98%EF%BC%9Asin45%C2%B0-cos60%C2%B0%2Btan60%C2%B0%3D%3Fcos%26%23178%3B30%C2%B0%2Bsin%26%23178%3B30%C2%B0-tan45%C2%B0%3D%3Fsin30%C2%B0-tan30%C2%B0%2Bcos45%C2%B0%3D%3F2%E9%A2%98%EF%BC%9A%E5%B7%B2%E7%9F%A5%E2%88%A0A%E6%98%AF%E9%94%90%E8%A7%92%2CcosA%3D5%E5%88%86%E4%B9%8B3%2C%E6%B1%82sinA%2CtanA%3F)
sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?1题:sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?2题:已知∠A是锐角,cosA=5分之3,求sinA,tanA?
sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?
1题:sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?
2题:已知∠A是锐角,cosA=5分之3,求sinA,tanA?
sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?1题:sin45°-cos60°+tan60°=?cos²30°+sin²30°-tan45°=?sin30°-tan30°+cos45°=?2题:已知∠A是锐角,cosA=5分之3,求sinA,tanA?
sin45°-cos60°+tan60°=?
=√2/2-1/2+√3
=(√2-1+2√3)/2
cos²30°+sin²30°-tan45°
=(3/4)+(1/4)-1
=1-1
=0
sin30°-tan30°+cos45°
=1/2-√3/3+√2/2
=(3-2√3+3√2)/6
已知∠A是锐角,cosA=5分之3,求sinA,tanA?
b=3k,则c=5k
∴a=4k
∴sinA=4k/5k=4/5,tanA=4k/3k=4/3
sin45°-cos60°+tan60°=根号下2/2-1/2+根号下3
cos²30°+sin²30°-tan45°=0
sin30°-tan30°+cos45°=1/2-根号下3/3+根号下2/2
cosA=5分之3,求sinA=4/5 ,tanA=4/3
QQ上我教你 给我分
第一个等于2分之(根号2-1+根号3);第二个等于0.。第三个等于(3-2倍根号3+3倍根号2)/6
sinA=4/5 tanA=4/3