How do you get tan 38?

How do you get tan 38?

Reading the values of tan 38° We want the value of tan 38°, i.e., tan 38° 0′. Now, move to the right in the row of 38 and reach the column of 0′. We find 0.7813. Therefore, tan 38° = 0.7813.

How do you find sin 39?

In a triangle which has one angle of 90 degrees, the sine of the angle of 39° is the ratio of the length of the opposite side o to the length of the hypotenuse h: sin 39° = o/h.

How do you find the degree of cosine?

2 Answers. You can convert radians into degrees by multiplying it with 180/Math. PI , Furthermore the inverse cosine (or cos^-1 like some textbooks denote this) is the Math.

How do you find the value of 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 cos120?

The angles of a right-angled triangle are expressed in terms of multiples or sub-multiples of 180⁰, or π in radians. Hence, to find the value of cos 120⁰, we will have to express 120⁰ in terms of 180⁰ or 90⁰. Since, cos (180⁰ – x) = – cos x. Since, cos (90⁰ + x) = – sin x.

What is cos330?

cos(330º)=√32.

What is the exact value of cos300?

1/2

Can you have a negative reference angle?

In particular, reference angles are never negative . A reference angle can be zero: this happens when the original angle’s terminal point lies on the x -axis. That is, the reference angle is zero whenever the original angle’s terminal point is either (1,0) or (−1,0) .

How do you determine if an acute angle is positive?

To do this, consider a right triangle drawn on the coordinate axes. The positive acute angle θ will be the angle created between the x -axis and the hypotenuse of the triangle. The lengths of the two legs of the triangle will be the x and y coordinates of a point in the first quadrant.

What is the reference angle for 315?

We know that the positive x-axis is represented with 0∘ or 360∘ . Let us subtract the given angle from 360∘ to find the reference angle or 315∘ . So, the reference angle is 360∘−315∘=45∘ . ∴ We have found the reference angle for 315 degrees as 45∘ .