Cosine and Sine Angle Addition Intuition
96367
Intuition of Addition Formula for Sine and Cosine
46665
Solving $\cos x+\sin x-1=0$
100777
Finding the derivatives of sin(x) and cos(x)
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$
89561
Find the sum of angles without trigonometry?
96065
Question about sines of angles in an acute triangle
135895
Proving the bounds of cosine
127247
Why are cosine and sine functions used when representing a signal or a wave?
67035
History of dot product and cosine
9479
$\sum \cos$ when angles are in arithmetic progression
41943
Why is it that when proving trig identities, one must work both sides independently?
73538
solving $\cos z + \sin z = i$
12841
Ratio of sines given, find ratio of cosines?
43605
If $\sin(a)\sin(b)\sin(c)+\cos(a)\cos(b)=1$ then find the value of $\sin(c)$
140984
Sum of Cosine/Exponential
75570
Easy way of memorizing values of sine, cosine, and tangent
132859
How does C compute sin() and other math functions?