邻边=1+(-1)3 对-1进行3次方运算。 邻边=1-1 从1中减去1。 邻边=0 将0重写为02。 邻边=02 邻边=0 邻边=0=0 求余弦值。 点击获取更多步骤... 使用余弦的定义求cos(3theta)的值。 cos(3theta)=adjhyp cos(3theta)=01 用0除以1。
sin3θ=sin(2θ+θ)=sin2θcosθ+cos2θsinθ =2sinθcosθcosθ+[1-2(sinθ)^2]sinθ =2sinθ[1-(sinθ)^2]+[1-2(sinθ)^2]sinθ =2sinθ-2(sinθ)^3+sinθ-2(sinθ)^3 =3sinθ-4(sinθ)^3
If 1+sin^(2)theta=3sin theta cos theta, then prove that tan theta=1 or tan theta=(1)/(2) View Solution If 1+sin^(2)theta=3sin theta cos theta, then prove that tan theta=1 or tan theta=(1)/(2) View Solution If sin theta=1/2 then prove that 3sin theta-4sin^3 theta=1...
【题目】在极坐标方程$$ r = \sin 3 \theta $$给出的曲线上,求对应于θ=π/4的点M处的切线方程和法线方程答案是$$ 2 x - 4 y + 1 = 0 $$$ 4 x + 2 y - 3 = $$ 相关知识点: 高等数学 坐标系与参数方程 点的极坐标和直角坐标的互化 试题...
theta - 2 \sin ^ { 3 } \theta = 2 \sin \theta \left( 1 - \sin ^ { 2 } \theta \right) + \sin \theta - 2 \sin ^ { 3 } \theta\$ \$= 2 \sin \theta - 2 \sin \theta + \sin \theta - 2 \sin \theta = 3 \sin \theta - 4 \sin ^ { 3 } \theta =\...
If sin 3 theta= cos(20^@-theta) , then theta is equal to: यदि sin 3 theta= cos(20^@-theta) है, तो theta का मान ज्ञात करें | If 3 Sin theta =2 cos^2 theta ,0^@ यदि 3 Sin theta =2 cos^2 theta है ...
\[\sin \theta = \frac{\text{Opposite Side} }{ \text{Hypothenuse} }\] What is sin equal to? Sin is a dimensionless amount, that measures the size of the inclination of an angle with respect to the horizontal reference, where the adjacent side is sitting. ...
यदि3sinθ=4cosθ, है, तोtan2θ+sinθ−cosθका मान किसके बराबर है? View Solution If sin 3 theta= cos(20^@-theta) , then theta is equal to: यदि sin 3 theta= cos(20^@-theta) है, तो theta ...
【解析】 解 曲线$$ r = a \sin 3 \theta $$的参数方程为 $$\left\{ \begin{matrix} x = r ( \theta ) \cos \theta = a \sin 3 \theta \cos \theta \end{matrix} \right.$$ $$\left\{ \begin{matrix} y = r ( \theta ) \sin \theta = a \sin 3 \theta \sin \thet...
【解析】 由题意利用韦达定理知:$$ \sin \theta + \cos \theta = a $$,sin θ. $$ \cos \theta = a $$. ∵$$ ( \sin \theta + \cos \theta ) ^ { 2 } = 1 + 2 \sin \theta \cos \theta $$,∴$$ a ^ { 2 } = 1 + 2 $$ a. 解得:$$ a = 1 - \squa...