admin百科知識 2022-02-13 3:46:54 tan(θ2)=-13,則sin[θ+(π4)]=?tan(θ/2)=-1/3,則sin[θ (π/4)]=?網友廻答:匿名網友萬能置換cosθ=[1-tan(θ/2)^2]/[1 tan(θ/2)^2] =4/5sinθ=[2tan(θ/2)]/[1 tan(θ/2)^2] =-3/5sin[θ (π/4)]=sinθ*cos(π/4) cosθ*sin(π/4)=(√2)/10 db標簽 生活常識_百科知識_各類知識大全»tan(θ2)=-13,則sin[θ+(π4)]=?
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