Find the exact value of sec 5pi/4.

Question

nnesha · Answer

what's the definition of sec ?
what's the reciprocal of sec ?

anonymous · Answer

opposite tan adjacent

hypotenuse/ adjacent

nnesha · Answer

nice right 
but i was asking reciprocal 
like sin = 1/csc  and csc = 1/sin
so sec = ?

anonymous · Answer

1/cosθ

nnesha · Answer

right now we can use unit circle to find EXACT value of cos at 5pi/4 angle

nnesha · Answer

|dw:1446042909015:dw|
cos is what at 5pi/4
remember (x,y) ordered pair 
where x-coordinate represent `cos theta` 
and y-coordinate represent sin tehta

anonymous · Answer

dont understand

nnesha · Answer

hmm okay :=))
so do you know how to find exact value by looking at the unit circle ???
here is an example 
if i have to find sin pi/4  then|dw:1446043264335:dw|
sqrt{2}/2 is an exact value of sin pi/4