所以cos\alpha =0.6或cos\alpha =-0.6 cos2\alpha =1-2sin^2\alpha =1-2\times 0.64=-0.28 当cos\alpha =0.6时, sin2\alpha =2sin\alpha cos\alpha =2\times 0.8\times 0.6=0.96 当cos\alpha =-0.6时, sin2\alpha =2sin\alpha cos\alpha =2\times 0.8\times (-0.6)=-0.96 综上,cos2\...
知识点二 二倍角的正弦、余弦、正切公式(1)$$ \sin 2 \alpha = \_ ; $$(2)$$ ) \cos 2 \alpha = \_ = \_ - 1 = 1 - \_ $$(3)$$ \tan 2 \alpha = ( \alpha \neq \frac { k \pi } { 2 } + \frac { \pi } { 4 } $$且$$ \alpha \neq k \pi ...
2sin2α=cos2α+1 來自Web 搜索的類似問題 If sinα+cosα=0.2, find the numerical value of sin2α. https://math.stackexchange.com/questions/451199/if-sin-alpha-cos-alpha-0-2-find-the-numerical-value-of-sin2-alpha You also know that sin2α+cos2α=1, so square what you are given...
Ifα+β−γ=πProve that(sin2α+sin2β−sin2γ)=2sin alpha ×2sin beta ×2 cos gamma#? https://socratic.org/questions/if-alpha-beta-gamma-pi-prove-that-sin-2alpha-sin-2beta-sin-2gamma-2sin-alpha-2si P dilip_k Jul 9, 2018LHS=si...
求助三道高一数学三角函数题1、用tan(alpha)表示tan(alpha/2)2、化简:sin(50)(1+根号3tan(10))(角度)3、求证:(1-tan^2(alpha/2))/(1+tan^2(alpha/2))=cos(alpha)详细过程,谢谢
知识点二 二倍角的正弦、余弦、正切公式(1)$$ \sin 2 \alpha = \_ ; $$(2)$$ \cos 2 \alpha = \_ = \_ - 1 = 1 - \_ $$(3)$$ \tan 2 \alpha = ( \alpha \neq \frac { k \pi } { 2 } + \frac { \pi } { 4 } $$且$$ \alpha \neq k \pi + \...
1.倍角公式(1)$$ S _ { 2 \alpha } : \sin 2 \alpha = \_ ; $$(2)$$ _ { 2 \alpha } : \cos 2
sin^(3)xsin(x+alpha)=sin^(3)x(sinx cos alpha + cosx sin alpha) =sin^(4)x(cos alpha+cotx sin alpha) I=int(1)/(sqrt(sin^(3)xsin(x+alpha)))dx =int(1)/(sin^(2)xsqrt(cos alpha +cotxsin alpha))dx =int("cosec"^(2)x)/(sqrt(cos alpha+cotx sin alpha))dx
sin2α(1−ctg2α) 来自Web 搜索的类似问题 prove that if sin2α+sin2β+sin2γ=2 then the triangle has a right angle https://math.stackexchange.com/questions/793591/prove-that-if-sin2-alpha-sin2-beta-sin2-gamma-2-then-the-triangle Rearranging, we ...
যদি alpha+gamma=2beta হয় তবে দেখাও যে,cotbeta=(sinalpha-singamma)/(cosgamma-cosalpha)