By using values of X Y and r calculate tan 90degree 4sin 49

By using values of X, Y and r calculate tan (- 90degree) -4sin ^490degree + 5 cos ^3 180 Degree

Solution

whe p is terminal angle

a)tan(p)=y/x

at 90⁰,y->,x->0

tan90^o=y/x =

b)sin(p)=y/r

at 90⁰, y->r

sin(90⁰)=r/r =1

cos(p)=x/r

at 180⁰, x->-r

cos(180⁰)=-r/r=-1

-4sin⁴(90^o)+5cos³(180^o)

=-4(1)⁴+5(-1)³

=-4-5

=-9