要计算 sin270∘\sin 270^\circsin270∘,我们可以利用三角函数的周期性和对称性来简化计算。 周期性和对称性: 正弦函数 sinθ\sin \thetasinθ 的周期为 360∘360^\circ360∘,这意味着 sin(θ+360∘n)=sinθ\sin (\theta + 360^\circ n) = \sin \thetasin(θ+360∘n)=...
cos theta + sin ( 270^(@) +theta )- sin ( 270^(@) -theta )+ cos ( 180^... 03:46 sin 10^(@) cos 20^(@) tan 40^(@) tan 50^(@) cosec 70^(@) sec 80^(@) =1 04:05 sin theta + sin ( theta -pi ) + cos((pi)/(2) + theta) +cos ((5pi)/( 2)... 03:...
sin(−90)=−1 Explanation: sin−90=sin(360−90)=sin270 Angle 270∘ is third ... sin(510) https://www.tiger-algebra.com/drill/sin(510)/ Calculate the value of the sin of 510 ° To enter an angle in radians, enter sin(510RAD) sin(510 °) = 0.5 Sine, in mathematics,...
[ \sin\theta = \frac{\text{对边}}{\text{斜边}} ] 二、特殊角的正弦值 常见角度的正弦值可直接记忆: ( \sin0°=0 ) ( \sin30°=\frac{1}{2} ) ( \sin45°=\frac{\sqrt{2}}{2} ) ( \sin60°=\frac{\sqrt{3}}{2} ) ( \sin90°=1 ) ( \sin180°=0 ...
tan theta = 1 / sqrt 3 అయిన 7 sin^(2) theta + 3 cos^(2) theta= 01:58 cos^2 0^@+cos^2 60^@ = 01:12 sin(270^@+theta)= 05:26 If A,B are acute angles , sin(A-B)=1/2 , sin A = 1/2 , then B= 04:09 In Delta ABC , if a= 2, b= 3 , c=4 ...
定义:正弦函数定义为直角三角形中一个锐角的对边长度与斜边长度的比值。对于一个角度θ(通常以弧度或度为单位),其正弦值表示为sin(θ)。 公式: [ \sin(\theta) = \frac{\text{对边长}}{\text{斜边长}} ] 性质: sin(0°) = 0, sin(90°) = 1, sin(180°) = 0, sin(270°) = -1, sin(...
\displaystyle sin\theta+sin\phi=2sin(\frac{\theta+\phi}{2})\cdot cos(\frac{\theta-\phi}{2}) ⑵.公式3-②推导 根据前面的公式1-③、1-④。 cos(α+β)=cosα·cosβ-sinα·sinβ···1-③ cos(α-β)=cosα·cosβ+sinα·sinβ···1-④ 二式相加,得 ...
Use the graph of \sin(\theta) to estimate the value for \theta when \sin(\theta)=-0.4 for 90^o \leq \theta \leq 270^o Draw a straight line from the axis of the known value to the sine curve. Draw a straight, perpendicular line at the intersection point to the other axis. ...
运用余弦差公式 $\cos(A - B) = \cos A \cos B + \sin A \sin B$,令 $A = \theta + 21°$,$B = \theta - 24°$,则原式化简为: cos[(θ +21°) - (θ -24°)] = cos(45°) = (√2)2. **(2)** 通过角度转换和恒等式化简: - $\sin167° = \sin(180°-13°) = ...
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