Question

Срочно помогите задание 319

Answer 1

Пошаговое объяснение:

318.

a) sin 94" = sin (90° + 4°) = cos 4°

b) cos 105 deg. = -cos (180° - 105°) = -cos 75°

319.

a) sin (90° + alpha) = cos alpha

b) cos (90° + alpha) = -sin alpha

320.

a) sin (180°) = 0

b) tg 192° = tg (180° + 12°) = -tg 12°

c) cos 269° = -cos (270° - 1°) = sin 1°

d) sin 282° = sin (360° - 78°) = -sin 78°

e) ctg (90° + alpha) = -tg alpha

f) cos(alpha + 90°) = -sin alpha

g) tg (alpha + 180°) = tg alpha

h) (180 - m)° = 180° - m° (providing that m < 180)