Thread: trig ratios

write each of the following as the ratios of positive acute angles.

in the examples i understand that

but can someone please explain to me how it is that

=

and =

i understand that = 180 but i am not geting it when i express each of the sectors in terms of

Originally Posted by sigma1

write each of the following as the ratios of positive acute angles.

in the examples i understand that

but can someone please explain to me how it is that

=

and =

i understand that = 180 but i am not geting it when i express each of the sectors in terms of

Hi sigma1,

is a QII angle. Related angle is .
Cosine is negative in the second quadrant.

is a QI angle. Cosine is positive in the first quadrant.

Therefore,

The sin function is an odd function, meaning



Related angle is

is a QII angle. Sin is positive in the first and second quadrants.

Therefore,