Question

已知角a的终边通过点P(-3,4),则sin a+cos a+tan a等于?

Answer 1

x=-3,y=4
r=√(x²+y²)=5
所以原式=y/r+x/r+y/x=-17/15

Answer 2

角a的终边通过点P(-3,4),
则sina=4/5
cos=-3/5
tana=-4/3
sin a+cos a+tan a
=4/5-3/5-4/3
=-17/15