Posted on April 23, 2022 (Updated on July 9, 2025)

What is the value of 1 Cos?

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What is the value of 1 by cos?

The value of 1+cosΘ is 2sin²(Θ/2).

What is the formula of 1 COSX?

Answer: The formula of (1 – cos x) / sin x = tan (x/2)

What is COSX equal to?

Remember the Pythagorean triple 8, 15, 17? The reference triangle has horizontal leg 8, vertical leg 15, hypotenuse 17…so cos x = 8/17. Another way to do this is to recall that 1 + tan2x = sec2x & secant is reciprocal of cosine.

What is the minimum value of 1 Cos?

Maths keeps one mentally active. The minimum value of 1 + cos x = 0 and it occurs when x = 180 deg or π. The maximum value of 1 + cos x = 2 and it occurs when x = 0 deg.

What is COS 1 called?

Likewise cos–1 is called acos or arccos. And tan–1 is called atan or arctan.

Can Cos equal 1?

in other words cos (360º) =1, the answer is x=360º or x=2π radians. 3) you can check your answer in your graphing calculator by pressing mode and making sure that your calculator is in degree. Now that you calculator is in degree you can type cos(360) press enter and that answer should be 1. So cos(360) =1.

What is COS 1 in degrees?

As you can see below, the cos–1 (1) is 270° or, in radian measure, 3Π/2 .

Can Cos be more than 1?

The sine and cosine ratios of an angle cannot be greater than 1.

What is cos theta?

The Cos theta or cos θ is the ratio of the adjacent side to the hypotenuse, where θ is one of the acute angles.

What is the formula for cosine?

The cosine formulas using the law of cosines are, cos A = (b2 + c2 – a2) / (2bc) cos B = (c2 + a2 – b2) / (2ac) cos C = (a2 + b2 – c2) / (2ab)

How do you find cos theta?

Just remember the cosine of an angle is the side adjacent to the angle divided by the hypotenuse of the triangle. In the diagram, the adjacent side is a and the hypotenuse is c , so cosθ=ac . To find θ , you use the arccos function, which has the same relationship to cosine as arcsin has to sine.

What value of Cos gives 0?

1

The value of cos 0 is 1. Here, we will discuss the value for cos 0 degrees and how the values are derived using the quadrants of a unit circle. The trigonometric functions are also known as an angle function that relates the angles of a triangle to the length of the triangle sides.

What is cos at pi 3?

The value of cos pi/3 is 0.5. Cos pi/3 radians in degrees is written as cos ((π/3) × 180°/π), i.e., cos (60°).

What is the value of cosine at 135?

-0.7071

The value of cos 135° is equal to the x-coordinate (-0.7071). ∴ cos 135° = -0.7071.

What is the value of cosine at 270?

0

Cos 270 degrees is the value of cosine trigonometric function for an angle equal to 270 degrees. The value of cos 270° is 0.

What is value of cos45?

The exact value of cos 45 degrees is 1/√2 (in surd form), which is also equal to sin 45 degrees. It is an irrational number, equal to 0.7071067812… in decimal form. The approximate value of cos 45 is equal to 0.7071.

How do you find the value of cos 120?

The value of cos 120 degrees can be calculated by constructing an angle of 120° with the x-axis, and then finding the coordinates of the corresponding point (-0.5, 0.866) on the unit circle. The value of cos 120° is equal to the x-coordinate (-0.5). ∴ cos 120° = -0.5.

What is the value of cos150?

Answer: The exact value of cos (150∘) is −√3/2 and sin (150∘) is 1/2.

Is the value of cos 90?

The value of cos 90 is 0.

How do you find cos120 without a calculator?

Draw a unit circle (circle with radius one) and draw 120 degrees. Then find the reference angle (60 degrees). Since 120 degrees is in the second quadrant, the x values will be negative and the y values will be positive. This means that cos120 will be negative.

Which expression is equivalent to cos120?

Answer. The correct answer for the given question is option b) cos 240 degrees. This means that the expression cos 120 degrees can also be written as cos 240 degrees. This because cos 240 degrees = -1/2 = cos 120 degrees.

What is the exact value of sin240?

-0.866

Sin 240 degrees is the value of sine trigonometric function for an angle equal to 240 degrees. The value of sin 240° is -(√3/2) or -0.866 (approx).