SOLUTION: Suppose sin(t)=-3/4 amd sec(t)<0. Use identities cos(-t) why does (t) become positive instead of negative? I don't understand this idea at all. Please help Thank you

Question 962223: Suppose sin(t)=-3/4 amd sec(t)<0. Use identities
cos(-t) why does (t) become positive instead of negative? I don't understand this idea at all.
Please help
Thank you
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Suppose sin(t)=-3/4 amd sec(t)<0. Use identities
cos(-t) why does (t) become positive instead of negative? I don't understand this idea at all.
***
I'm not sure what your question is, but my guess it is something about the following Identity:
cosx=cos(-x)
The cos function is always positive whether the angle is in quadrant I or quadrant IV, or the right half of the unit circle. Its negative in the left half of the unit circle.
Similarly, the sin function is positive in the top half and negative in the bottom half of the unit circle.
hope I answered your question.
RELATED QUESTIONS
Suppose cos(t)=-1/3 and sin(t)<0 Use appropriate identities to find each of the... (answered by lwsshak3)

Suppose cos(t)=-1/3 and sin(t)<0 Use appropriate identities to find each of the... (answered by KMST)

Use fundamental identities to write the first expression in terms of the second, if 0 < t (answered by ikleyn)

suppose sin t=2/7 and cos t < 0. find each of the following values: cos t, tan t, csc t,... (answered by lwsshak3)

Suppose sin t = 6/7 and cos t < 0. Find each of the following (exact values): cos (answered by solver91311)

Suppose sin t = 4 7 and cos t < 0. Find each of the following (exact values):... (answered by stanbon)

Suppose sin t = 4/7 and cos t < 0. Find each of the following (exact values):... (answered by josgarithmetic,MathTherapy)

Suppose sec t = 2 and csc t > 0. Find each of the following: cos t = cos (−t) = (answered by jim_thompson5910)

Suppose sec t = 2 and csc t > 0. Find each of the following: cos t = cos (−t) = (answered by stanbon)