Question

Find all solutions w between 0 and 360, inclusive:
(a) cosw = cos(−340)
(b) cosw = sin 20
(c) sinw = cos(−10)
(d) sin w < − 1/2
(e) 1 < tanw

Answer 1

a cos 20
b cos (90-20) = cos 70
c sin (90 - -10) = cos -10 = sin 100
d 30 deg from x axis in quadrants 3 and 4 for -sin so below 210 and 330
e above 45 degrees in quadrant 1 and below 225 in quadrant 3

Answer 2

a) w = 20 or 340
b) w = 70 or 290
c) w = 80 or 100
d) 210 < w < 330
e) 45 < w < 90 or 225 < w < 270

Damon’s answers are all either incomplete or incorrect