Question

Show that: sin(40°+x) cos(10°+x)-cos(40°+x)×sin(10°+x)=one by two

Answer 1

{sin(x+y)=sinx cosy - cosx siny
sin(40+x-(10+x))
sin(40-10-x-x)
sin(30)
=>1/2

Answer 2

Answer:

Explanation:

sin(x+y)=sinx cosy - cosx siny

sin(40+x-(10+x))

sin(40-10-x-x)

sin(30)

=>1/2