Question

va rog ex 1 e urgent

Answer 1

1.

a) =(sin(5pi/24 - pi/8) + sin(5pi/24 + pi/8)):2

= (sin(2pi/24) + sin(8pi/24)) : 2

= sin 15° + sin 60° = (cred ca este indicat sa te opresti AICI)

= (rad(1-cos 30° / 2) + rad3 / 2): 2 =

= (rad((1-rad3 / 2)/2) + rad3 / 2) :2

b) = cos(-2pi/24) + cos(8pi/24) : 2

= cos 2pi/24 + cos 8pi/24 : 2

= cos 15° + cos 60° : 2

c) = cos dif -cos sum / 2

dif= 9pi-7pi / 24 = 2pi/24 = 15°

sum= 9pi+7pi / 24 = 16pi/24 = 2pi/3 = 120° ⇒

= cos 15° - cos 120° / 2

= cos 15° + cos(180° - 120°) / 2

= cos 15° + cos 60° / 2