## What angle is Coterminal with 19pi 4?

Subtract 2π 2 π from 19π4 19 π 4 . The resulting angle of 11π4 11 π 4 is positive, less than 2π 2 π , and coterminal with 19π4 19 π 4 .

**What is the value of sin 19 PI by 4?**

√22

The exact value of sin(π4) sin ( π 4 ) is √22 .

### How do you find the exact value of sec 19pi 6?

Make the expression negative because secant is negative in the third quadrant. The exact value of sec(π6) sec ( π 6 ) is 2√3 . Multiply 2√3 by √3√3 .

**What is the value of cos 19 PI by 4?**

The exact value of cos(π4) cos ( π 4 ) is √22 .

## What is the reference angle of 19pi 3?

Since π3 is in the first quadrant, the reference angle is π3 .

**How do you find the exact value of tan15?**

Value of Tan 15

- Tan (15°) can be found if we know the value of sin 15 degrees and cos 15 degrees.
- From the above table, we have the values of tan, sin and cos ratios for 0°, 30°, 45°, 60° and 90°.
- tan (15°) = √3 – 1/ √3 + 1.
- Hence, the value of tan (15°) is √3 – 1/√3 + 1.
- ∴ Tan (15°) = (1.732 – 1)/(1.732 + 1) = 0.2679.

### What is the reference angle for 19pi 5?

Find an angle that is positive, less than 2π , and coterminal with 19π5 19 π 5 . Subtract 2π 2 π from 19π5 19 π 5 . The resulting angle of 9π5 9 π 5 is positive, less than 2π 2 π , and coterminal with 19π5 19 π 5 . Since the angle 9π5 9 π 5 is in the fourth quadrant, subtract 9π5 9 π 5 from 2π .

**What angle is Coterminal with 19pi 6?**

Trigonometry Examples Find an angle that is positive, less than 2π , and coterminal with 19π6 19 π 6 . Subtract 2π 2 π from 19π6 19 π 6 . The resulting angle of 7π6 7 π 6 is positive, less than 2π 2 π , and coterminal with 19π6 19 π 6 .

## What is 19pi 6 on the unit circle?

Thus, cos(19π6)=cos(7π6) .

**What is the value of cos 15 )?**

Answer: The value of cos 15° = (√3+1)/2√2.