Question

If the sin 90 degrees is 1 then the cos is what degrees?

Answer 1

0

Answer 2

\[\sin^2(90)+\cos^2(90)=1\]
\[1+\cos^2(90)=1\]
\[cos^2(90)=0\]
\[cos(90)=0\]

Answer 3

So cos (0 degrees) would be 1?

Answer 4

@mustafa2014 Can you show the proof geometrically? I can't recall it