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)=...
sec ( theta -270^(@) ) का मान ज्ञात कीजिए| 02:34 सिद्ध करें की sin (270^@ +A)=-cos A 03:19 सिद्ध कीजिए की: cos ( 270^(@) -A) =-sin A 01:45 सिद्ध ...
[ \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 ...
Given x cos theta + y sin theta = 2 and x cos theta - y sin theta ... 03:38 Which of the following is /are the value (s) of the the expression ? ... 04:48 If sin A = (2 m n)/( m^(2) + n^(2)) , What is the value of tan A ? 03:43 If sec^(2) theta +...
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,...
1. sin 90° = 1 the most common trigonometric sine functions are sin 90 degree plus theta \(\begin{array}{l}\sin (90^{\circ}+\theta )=\cos \theta\end{array} \) sin 90 degree minus theta \(\begin{array}{l}\sin (90^{\circ}-\theta )=\cos \theta\end{array} \) some ...
{eq}sin \theta = \frac{y}{r} {/eq} {eq}cos \theta = \frac{x}{r} {/eq}. These ratios create various key points as the angle rotates around the circle. The common special relationships can be seen on the unit circle. The Unit Circle Some key points to note are what happens at...
At the point (0,-1) we can say \sin(270)=-1 as the angle \theta is 270^o . Continuing the point around the unit circle back to the coordinate (1,0) , we get \sin(360)=0 as \theta has made a full turn back to the positive x axis. \sin(\theta) is as periodic function...
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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