1) Sketch the reference triangle if possible, then find cos , sin , tan at the following coordinates:

a) ( 0, 4)

b) (-0.6, 0.8 )

c) (, -2 )

d) (sqrt(6), sqrt(19))

2) Evaluate: ( mention quadrant and sketch them )

a) cos where tan = 15 / 8 and sin is negative.

b) csc where cos = 2 / sqrt(10) in the fourth quadrant

c) cot where csc = in the second quadrant.

3) Evaluate by drawing reference triangle where appropriate and simplifying each set of ()'s

a) cot(cos^-1(sin(arctan e/10)))

b) csc(sin^-1(cos(arctan -3/4)))

c) csc(cos^-1(sin(arctan sqrt(3)))

d) sin^-1(sin(tan^-1(tan -17 / 6)))

e) csc(tan^-1(sin(cos^-1 sqrt(5) / 4 )))

f) tan(sin^-1(cos(csc^-1 (10/)))