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by using rightangle triangle

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Q: How do you find the reference angles for cos?
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Related questions

Find all angles in the interval 0 360 satisfying the equation cos theta equals 0.7902?

cos(theta) = 0.7902 arcos(0.7902) = theta = 38 degrees you find complimentary angles


Value of Cos 2 Cos inverse 0.8?

If the angles are measured in radians then the answer is -0.2678


Do all angles have reference angles?

yes


Can you find the reference angle of a quadrantal angle?

Yes. Quadrantal angles have reference angles of either 0 degrees (e.g. 0 degrees and 180 degrees) or 90 degrees (e.g. 90 degrees and 270 degrees).


Why does sin plus cos equal one?

There is no reason at all. For most angles sin plus cos do not equal one.


What are the 3 angles?

sin cos tan -soh cah toa


How to determine the angle of a triangle if you know the length of its sides?

If you know the length of the sides of a triangle you can find all the angles of the triangle using the Law of cosines such as: Step 1. cos A = (b^2 + c^2 - a^2)/(2bc) cos B = (a^2 + c^2 - b^2)/(2ac) cos C = (a^2 + b^2 - c^2)/(2ab) Step 2. Find the arc cosine A, arc cosine B, and arc cosine C in order to find the angles A, B, and C.


What is the relationship between the cos and sin of the non 90 degree angles in a right angle triangle?

sin θ = cos (90° - θ) cos θ = sin (90° - θ)


What is the relationship between sine and cosine of the complementary angles?

sin(x) = cos(90° - x) cos(x) = sin(90° - x)


What is the cos of angle 'a' with the measurements 5 13 12?

The answer depends on which of the three angles 'a' is!


Cos 195 degree use the trigonometry functions of quadrantal angles and special to find the exact value?

cos(195) = cos(180 + 15) = cos(180)*cos(15) - sin(180)*sin(15) = -1*cos(15) - 0*sim(15) = -cos(15) = -cos(60 - 45) = -[cos(60)*cos(45) + sin(60)*sin(45)] = -(1/2)*sqrt(2)/2 - sqrt(3)/2*sqrt(2)/2 = - 1/4*sqrt(2)*(1 + sqrt3) or -1/4*[sqrt(2) + sqrt(6)]


What is the relationship between the acute angles of a right triangle?

There are many. For example, if A and B are the two acute angles, then A + B = 90 degrees or sin(A) = cos(B) or cos(A) = sin(B) or tan(A) = 1/tan(B)