Original post by Piza
Hi!
So i’ve always used:
sin: 180-ans
cos: 360-ans
tan:180+ans
for the second angle in trig instead of the cast diagram because it’s quicker, but how would you go about finding the second angle for the inverse and reciprocal functions? Do you just do the same thing?
So i’ve always used:
sin: 180-ans
cos: 360-ans
tan:180+ans
for the second angle in trig instead of the cast diagram because it’s quicker, but how would you go about finding the second angle for the inverse and reciprocal functions? Do you just do the same thing?
Sin is symmetric about 90 and 270 (where sin is +/-1), so the y-axis in cast.
Cos is symmetric about 0 and 180 (where cos is +/-1) so the x-axis in cast.
Are you talking about sec() and cosec()? Just use the above "rules"
(edited 3 years ago)
Original post by Piza
yep, so for sec() i would just do 360-ans?
sec(x) = 1/cos(x)
So the cos() rule also applies to sec().
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