Question

Найдите значение выражения a. sin 330 b. tg 300 c. ctg (-225) d. sin (-150) e. tg (-225) f. cos 120

Answer 1

A) =1/2
b)=
$- \sqrt{3}$
c) =-1
d)=-1/2
e)=-1
f) =-1/2

Answer 2

a. sin 330:

sin(330) = sin(360-30) = -sin(30) = -0.5

b. tg 300:

tg(300) = tg(300-360) = tg(-60) = -sqrt(3)

c. ctg(-225):

ctg(-225) = 1/tan(-225) = 1/tan(135) = 1/-1 = -1

d. sin(-150):

sin(-150) = -sin(150) = -0.5

e. tg(-225):

tg(-225) = tg(-225+360) = tg(135) = -1

f. cos 120:

cos(120) = cos(360-240) = cos(-240) = -0.5

Note: In trigonometry, angles are measured in degrees or radians. The standard unit of measuring angles in mathematics is radians.