Find the exact values of sin 2?, cos 2?, and tan 2? for the given value of ?. cos ? =  4 5;    0° < ? < 90°

Q: Use reference angles to find the exact value of the expression cos 3π/4. Do not use a calculator.

A: The given angle is in second quadrant, and the value of cosine is negative in second quadrant.

Q: Find exact and approximate values for sin 45°.

A: Isosceles right triangle An isosceles right triangle with sides 1. Now find the hypotenuse side…

Q: Determine the exact value of cos (15°), sin (15°), and tan(15°).

A: To find the value of: cos (15°), sin (15°), and tan(15°)   Using trigonometric formula:

Q: Find the exact value using sun and difference formulas.  sin(cos-1 5/13 - sec-1 5/4)

A: Let,I=sincos-1513-sec-154using…

Q: If cos 0 7 and 0 is acute, find the exact value of tan 0.

A:

Q: -Sin(60° ) tan(210°)/cos 135° Simplify

A: find the values of sin (60°), tan(210°) and cos(135°) and plug in to given expression as following:-

Q: Find the exact value. a. cos, 2.

A: a. Obtain the value of cos3π2, cos3π2=cos2π-π2=cosπ2=0   Thus, the exact value of cos3π2 is 0.

Q: V3 Give the exact value of tan ( cos 2

A: