cos 840 find the value

Asked by ramakoti61 | 9th Jul, 2018, 08:45: PM

Expert Answer:

cos(840º) = cos (90º × 7 + 30º)
               = -sin30°
               = -1/2 = - 0.5

Answered by Sneha shidid | 11th Jul, 2018, 10:49: AM