What is the sine, cosine, tangent, cotangent, cosecant, and secant of -90 degrees?
1 Answer
Jun 4, 2015
sin -90 = - sin90= -1
cos-90=cos90=0
tan -90= -tan90=
cot-90= -cot90=0
csc-90=-csc90= -1/sin90= -1
sec-90= sec90= 1/cos90=
