# What is the value of 225?

The exact value of cos(225°) is -√(2) / 2.

Click to explore further. Also asked, what is the exact value of cos 225?

The exact value of cos(225°) is -√(2) / 2.

Similarly, how do you find the value of SEC? 1 Answer

Besides, what is the exact value of sin 255 degrees?

## How do you find COS 240?

1. 60∘ is an angle of one of the standard triangles with. cos(60∘)=12.
2. 240∘ is in the 3rd quadrant so (either by CAST or noting that the “x-side” of the associate triangle is negative) cos(240∘)=−cos(60∘)
3. cos(240∘)=−12.

How do you find the value of cos 270?

If this is the case, then at 90 degrees, we will intersect the unit circle at the point (0,1), and at 270 degrees we will be at (0,−1) . Given that, we can easily find the sine and cosine: sin(270o)=−1,cos(270o)=0,tan(270o)=−10= undefined.

### What is COS 120 in radians?

Important Angle Summary
120°2π/3-1/2
135°3π/4-√2/2
150°5π/6-√3/2
180°π-1

### What is the exact value of cos 315 degrees?

Important Angle Summary
240°4π/3-1/2
270°3π/2
300°5π/31/2
315°7π/4√2/2

### What is the exact value of sin 210?

The angle POQ is 30° and is called the related angle for 210°. and sin 210° = −sin 30° = − . tan 210° = tan 30° = − . In general, if lies in the third quadrant, the acute angle θ − 180° is called the related angle for θ.

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### What is sin270?

270 is an obtuse angle since it is greater than 90° sin(270) = -1. In Microsoft Excel or Google Sheets, you write this function as =SIN(RADIANS(270)) Since 270° is less than 90, we can express this in terms of a cofunction.

### What is sin180?

According to the Unit Circle, the coordinates for 180 degrees are (1,0). Sin is the y-coordinate. So sin 180= 0. NOTE: I assume that you mean sin of 180 degrees.

### How do you find cos 75?

Answer and Explanation: The value of cos(75°) is √6−√24 6 − 2 4 . Notice that we can write 75° as 30° + 45°.

### What is Secant formula?

Secant (sec) – Trigonometry function

In a right triangle, the secant of an angle is the length of the hypotenuse divided by the length of the adjacent side. In a formula, it is abbreviated to just ‘sec’. sec. x. =

### What is secant in terms of sin and cos?

Each of these functions are derived in some way from sine and cosine. The tangent of x is defined to be its sine divided by its cosine: The secant of x is 1 divided by the cosine of x: sec x = 1 cos x , and the cosecant of x is defined to be 1 divided by the sine of x: csc x = 1 sin x .

### What is the exact value of 5pi 6?

The exact value of sec6) sec ( π 6 ) is 2√3 . Multiply 2√3 by √3√3 . Combine and simplify the denominator. Multiply 2√3 2 3 and √3√3 3 3 .

### What is the inverse of cos?

arccos. The arccos function is the inverse of the cosine function. It returns the angle whose cosine is a given number.