In trigonometry, how can we find the sine/cosine of an angle larger than 90 degrees, if sine and cosine only work for right triangles?
69077
When the trig functions moved from the right triangle to the unit circle?
149447
Proving $\sin (x)=\cos (90^\circ-x)$
128661
Geometry question on right triangle
60709
How do I get $\cos{\theta} \lt \frac{\sin{\theta}}{\theta} \lt 1$?
108918
Can someone explain this trigonometric limit?
95979
Trigonometry and algebra question
86894
Finding solution of a Trigonometric equation
95633
Help with this trigonometry problem
29424
Maximum value of $\sin A+\sin B+\sin C$?
141137
Can we use sine and cosine graphs for varying temperatures?
1317
Combining cosine or sine terms into a single cosine or sine
31922
Integral of $\sin x \cos x$ using two methods differs by a constant?
64255
Trigonometry problem
96065
Question about sines of angles in an acute triangle
124897
How many ways are there to define sine and cosine?
60256
Is there a way to get trig functions without a calculator?
87489
Find range of $f(x)=3|\sin x|-4|\cos x|$