Ask a New Question

Question

State the exact values of the following.

cos(360 degrees)
sec(7pi/2)
tan(-9pi/2)

How do I do these?
Thanks!
13 years ago

Answers

Steve
Remember you can add or subtract 2pi = 360° without changing the values of the trig functions.

Then recall that for sin,tan,ctn,csc, f(-x) = -f(x)
for cos, sec, f(-x) = f(x)

cos 360° = cos(360°-360°) = cos 0°

sec(7pi/2) = sec(7pi/2 - 4pi) = sec(-pi/2) = sec(pi/2)

tan(-9pi/2) = tan(-9pi/2 + 4pi) = tan(-pi/2) = -tan(pi/2)
13 years ago

Related Questions

use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of... Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin... Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the symmetry of the graphs of sin... find the exact values of the six trig functions of angle... sin(-315degrees) how do i do thi... find the exact values of the six trig functions of the angle. -750 sin(-750)= cos(-750)=... What are the exact values for which tan t = -(sqrt3) Find the exact values of the six trigonometric functions for each of the following angles.draw the a... What are the exact values of a and b? Right triangle A B C is shown with labeled sides and one la... What are the exact values of a and b? Right triangle A B C is shown with labeled sides and one la... What are the exact values of a and b? Right triangle A B C is shown with labeled sides and one la...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use