# Cos 125 Cos 35 Sin 125 Sin 35

KlikBelajar.com – Cos 125 Cos 35 Sin 125 Sin 35

## Cos 125 Degrees

The value of
cos 125 degrees is -0.5735764. . .. Cos 125 degrees in radians is written as cos (125° × π/180°), i.e., cos (25π/36) or cos (2.181661. . .). In this article, we will discuss the methods to find the value of cos 125 degrees with examples.

• Cos 125°:
-0.5735764. . .
• Cos (-125 degrees):
-0.5735764. . .
• Cos 125° in radians:

cos (25π/36) or cos (2.1816615 . . .)

## What is the Value of Cos 125 Degrees?

The value of cos 125 degrees in decimal is -0.573576436. . .. Cos 125 degrees can also be expressed using the equivalent of the given angle (125 degrees) in radians (2.18166 . . .)

We know, using degree to radian conversion, θ in radians = θ in degrees × (pi/180°)
⇒ 125 degrees = 125° × (π/180°) rad = 25π/36 or 2.1816 . . .
∴ cos 125° = cos(2.1816) = -0.5735764. . .

Explanation:

For cos 125 degrees, the angle 125° lies between 90° and 180° (Second Quadrant). Since cosine function is negative in the second quadrant, thus cos 125° value = -0.5735764. . .
Since the cosine function is a periodic function, we can represent cos 125° as, cos 125 degrees = cos(125° + n × 360°), n ∈ Z.
⇒ cos 125° = cos 485° = cos 845°, and so on.
Note:
Since, cosine is an even function, the value of cos(-125°) = cos(125°).

Baca :   Tentukan Kpk Dari 10 Dan 12

## Methods to Find Value of Cos 125 Degrees

The cosine function is negative in the 2nd quadrant. The value of cos 125° is given as -0.57357. . .. We can find the value of cos 125 degrees by:

• Using Unit Circle
• Using Trigonometric Functions

## Cos 125 Degrees Using Unit Circle

To find the value of cos 125 degrees using the unit circle:

• Rotate ‘r’ anticlockwise to form 125° angle with the positive x-axis.
• The cos of 125 degrees equals the x-coordinate(-0.5736) of the point of intersection (-0.5736, 0.8192) of unit circle and r.

Hence the value of cos 125° = x = -0.5736 (approx)

## Cos 125° in Terms of Trigonometric Functions

Using trigonometry formulas, we can represent the cos 125 degrees as:

• ± √(1-sin²(125°))
• ± 1/√(1 + tan²(125°))
• ± cot 125°/√(1 + cot²(125°))
• ±√(cosec²(125°) – 1)/cosec 125°
• 1/sec 125°

Note: Since 125° lies in the 2nd Quadrant, the final value of cos 125° will be negative.

We can use trigonometric identities to represent cos 125° as,

• -cos(180° – 125°) = -cos 55°
• -cos(180° + 125°) = -cos 305°
• sin(90° + 125°) = sin 215°
• sin(90° – 125°) = sin(-35°)

☛ Also Check:

• cos 2 degrees
• cos 240 degrees
• cos 21 degrees
• cos 226 degrees
• cos 345 degrees
• cos 59 degrees

## FAQs on Cos 125 Degrees

### What is Cos 125 Degrees?

Cos 125 degrees is the value of cosine trigonometric function for an angle equal to 125 degrees.

The value of cos 125° is -0.5736 (approx)

### What is the Exact Value of cos 125 Degrees?

The
exact value of cos 125 degrees
can be given accurately up to 8 decimal places as -0.57357643.

Baca :   Berikut Ini Yang Bukan Merupakan Senyawa Ion Adalah

### How to Find Cos 125° in Terms of Other Trigonometric Functions?

Using trigonometry formula, the value of cos 125° can be given in terms of other trigonometric functions as:

• ± √(1-sin²(125°))
• ± 1/√(1 + tan²(125°))
• ± cot 125°/√(1 + cot²(125°))
• ± √(cosec²(125°) – 1)/cosec 125°
• 1/sec 125°

☛ Also check: trigonometry table

### How to Find the Value of Cos 125 Degrees?

The value of cos 125 degrees can be calculated by constructing an angle of 125° with the x-axis, and then finding the coordinates of the corresponding point (-0.5736, 0.8192) on the unit circle. The value of cos 125° is equal to the x-coordinate (-0.5736). ∴ cos 125° = -0.5736.

### What is the Value of Cos 125 Degrees in Terms of Cot 125°?

We can represent the cosine function in terms of the cotangent function using trig identities, cos 125° can be written as cot 125°/√(1 + cot²(125°)). Here, the value of cot 125° is equal to -0.70020.

### Cos 125 Cos 35 Sin 125 Sin 35

Sumber: https://www.cuemath.com/trigonometry/cos-125-degrees/

## Contoh Soal Perkalian Vektor

Contoh Soal Perkalian Vektor. Web log Koma – Setelah mempelajari beberapa operasi hitung pada vektor …