Question

Cos Theta=0.3412.Find Theta

Answer 1

Step-by-step explanation:

To solve this equation, you must find the unknown (theta).

cosθ= -0.5

Use the inverse of cosine (Arccos) to find the angle measurement (in degrees) of theta.

θ = arccos (-0.5)

If you reference a unit circle or use a calculator, that would be 120 degrees.

Hope this helped!

Answer 2

Answer:

Example 1:

If Sin x = 4/5, Find the value of Cos x?

Solution: Using Trigonometric identities: Cos2x = 1- Sin2x

Cos2x = 1 – (4/5)2

= 1 – 16/25

= (25 – 16) / 25

= 9/25

Cos x = 9/25−−−−√

= 3/5

Example 2: If Sec x = 4/7, find the Cos x?

Solution: As cos x = 1/sec x

Therefore, cos x = 1/ 4/7

= 7/4