Question

Solve cos pi without calculator. Show work

Answer 1

Answer:

I'm not sure what your difficulty is, so I'll use the geometrical definition to get the requested values. This definition means that when going a distance of θ counter-clockwise along the unit circle starting at (1,0), the coordinates of the point on the circle are (cosθ,sinθ).

Note that 0 corresponds to the point (1,0) on the unit circle, i.e.

sin(0)=0,cos(0)=1

π2 represents a quarter of a circle (90∘) wich corresponds to (0,1) on the unit circle, i.e.

sin(π2)=1,cos(π2)=0

Finally, π corresponds to half a circle (180∘) wich corresponds to (−1,0). This means

sin(π)=0,cos(π)=−1

may it helps u ☺️✌️