Cos 660 degrees is the value of cosine trigonometric function for an angle equal to 660 degrees. Understand methods to find the value of cos 660 degrees with examples and FAQs.

余弦计算器 三角 余弦 计算器。 余弦计算器 为了在计算器上计算cos（x）： 输入输入角度。 在组合框中选择度数（°）或弧度（rad）的角度类型。 按 = 按钮计算结果。

Use the Angle Sum identity: cos(s+t) =cos(s)cos(t)−sin(s)sin(t) = cos(180∘)cos(120∘)−sin(180∘)sin(120∘)

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. The exact value of cos(60) cos (60) is 1 2 1 2. The result can be shown in multiple forms.

三角学 示例 热门问题 三角学 求出精确值 cos (660) 解题步骤 1

2011年12月1日 · cos660=cos (660-720)=cos (-60)=cos60=0.5 sin120=sin60=根号3除以2 题目中是根号下SIN平方120度 ，本题中答案一致，即为根号3除以2 本回答由提问者推荐

The exact value of cos(60) cos ( 60) is 1 2 1 2. The result can be shown in multiple forms. Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics …

匿名用户 2013-05-21 cos (660度)=cos (300度)=cos (-60度)=cos (60度)=1/2 已赞过已踩过<

To obtain 660 degrees in radian multiply 660° by π / 180° = 11/3 π. Cos 660degrees = cos (11/3 × π). Our results of cos660° have been rounded to five decimal places. If you want cosine 660° …

The angle is given in degree measure. Problem: Find cos (660°) Level: intermediate algebra/precalculus #SVSUmicromath