SOLUTION: write cos t in terms of sin t, knowing that pi < t < 3pi/2 I got -sinpi/2-t. I was just wondering if I did that right or no and if you could provide steps if its not.

Algebra ->  Trigonometry-basics -> SOLUTION: write cos t in terms of sin t, knowing that pi < t < 3pi/2 I got -sinpi/2-t. I was just wondering if I did that right or no and if you could provide steps if its not.      Log On


   

Question 1177587: write cos t in terms of sin t, knowing that pi < t < 3pi/2
I got -sinpi/2-t. I was just wondering if I did that right or no and if you could provide steps if its not.
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

write cos%28t%29+in terms of sin%28t%29+
use identity sin%5E2%28t%29%2Bcos%5E2%28t%29=1
solve for cos%28t%29+
cos%5E2%28t%29=1-sin%5E2%28t%29+
cos%28t%29=sqrt%281-sin%5E2%28t%29+%29

Answer by ikleyn(52920) About Me  (Show Source):
You can put this solution on YOUR website!
.

The solution by @MathLover1 is FATALLY WRONG.


For correct solution/answer, see my post under this link

https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1177603.html

https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1177603.html