SOLUTION: Hi ma'am/sir can someone help me with this problem please? THANK YOU! Use the characteristics of f(t)=sin t to find the value of sin t when t=-21pi/4

Algebra ->  Trigonometry-basics -> SOLUTION: Hi ma'am/sir can someone help me with this problem please? THANK YOU! Use the characteristics of f(t)=sin t to find the value of sin t when t=-21pi/4      Log On


   

Question 1076860: Hi ma'am/sir can someone help me with this problem please? THANK YOU!
Use the characteristics of f(t)=sin t to find the value of sin t when t=-21pi/4
Answer by ikleyn(52812) About Me  (Show Source):
You can put this solution on YOUR website!
.
sin%2821pi%2F4%29 = sin%2821pi%2F4-2pi%29 = sin%2821pi%2F4-16%2F4%29 = sin%285pi%2F4%29 = -sin%28pi%2F4%29 = -sqrt%282%29%2F2.