How do I find the value of sec(3pi/4)? Trigonometry Right Triangles Trigonometric Functions of Any Angle 1 Answer टासी श. · Roella W. Oct 17, 2015 =1/cos((3pi)/4) =1/cos(pi - pi/4) // for first quadrant, all +ve =1/(sin (pi/4)) =1/(1/sqrt2) =sqrt2 Answer link Related questions How do you find the trigonometric functions of any angle? What is the reference angle? How do you use the ordered pairs on a unit circle to evaluate a trigonometric function of any angle? What is the reference angle for 140^\circ? How do you find the value of cot 300^@? What is the value of sin -45^@? How do you find the trigonometric functions of values that are greater than 360^@? How do you use the reference angles to find sin210cos330-tan 135? How do you know if sin 30 = sin 150? How do you show that (costheta)(sectheta) = 1 if theta=pi/4? See all questions in Trigonometric Functions of Any Angle Impact of this question 31311 views around the world You can reuse this answer Creative Commons License