Question

15.Find the value of: sin (80 + θ) cos (20 + θ ) – cos (80 + θ) sin (20 + θ).

Answer 1

Answer:

sorry bro dont know

i will try to find out

Answer 2

Answer:

$\sin(x) \cos(y) - \cos(x) \sin(y) = \sin(x - y)$

$\sin(80+θ ) \cos(20 +θ ) - \cos(80 + θ) \sin(20 + θ)$

$= \sin(80 +θ - 20 - θ) = \sin( 60 )$

$= \frac{ \sqrt{3} }{2}$

Root3/2 is your answer...