sin^2 60°+cos^2 60°-(根号2)cos45°
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sin^260°+cos^260°-(根号2)cos45°sin^260°+cos^260°-(根号2)cos45°sin^260°+cos^260°-(根号2)cos45°sin^260°+cos^
sin^2 60°+cos^2 60°-(根号2)cos45°
sin^2 60°+cos^2 60°-(根号2)cos45°
sin^2 60°+cos^2 60°-(根号2)cos45°
sin^2 60°+ cos^2 60°-(√2)cos45°
= (√3/2)² + (1/2)² - √2×√2/2
= 3/4 + 1/4 - 1
= 0
利用和差角公式化简 (2)sin(π/3+α)+sin(π/3-α)(2)sin(π/3+α)+sin(π/3-α)(3)cos(π/4+α)-cos(π/4-α)(4)cos(60°+α)+cos(60°-α)(5)sin(α-β)cosβ+cos(α-β)sinβ(6)cos(α+β)cosβ+sin(α+β)sinβ
2cos 30°-2sin 60°·cos 45°
化简1:cos(15°-a)sin15°-sin(165°+a)cos(-15°)2:根号下cos(60°-a)-sin(60°-a)
计算:⑴cos^2 30°+sin^2 30°-tan45° ⑵cos30°-sin°45/sin°60-Cos°45.务必要有计算过程!
sin^2 30°+cos()=1
cos 45°+tan 60° cos 30° 和 1+2sin 30°cos30°怎么算
2cos 30°-2sin 60°·cos 45°=?希望可以回答详细···
化简 sin(a+30°)+cos(a+60°) __________________________的结果是?2cos(360°-a)
若cos (x+30°)+sin x =4/5,则cos (2x-60°)等于?
√(cos 60°-1)²+2√cot 45°-sin 60°+|sin 30°-1|=?
【根号2×cosα-2sin(45°-α)】/2sin(60°+α)-根号3×cosα的值是?
化简:sin(x+60°)+2sin(x-60°)-根号下3cos(120°-x)
化简:sin(x+60°)+2sin(x-60°)-√3cos(120°-x)=
sin²60°+cos²60°-根号2cos45°跪求,sin²乘以x怎么算
已知cos(α-β)cos(β-γ)-sin(α-β)sin(β-γ)=1/3,γ=60°,π/2
cosα+根号3/3sinα怎么化成2根号3/3sinα(60°+α)
化简 sin^2 a+cos a*cos(60+a)-sin^(30-a)=
化简 sin^2 a+cos a*cos(60+a)-sin^(30-a)=