Question

Is it right say Cos ( 60+ 30 ) Cos6o. cos 30- sin 30,
Prove it it is yes.​

Answer 1

Step-by-step explanation:

LHS

cos(60+30)=cos(90)=0

RHS

now,

cos 60 = 1/2

cos 30 = √3/2

sin 60 = √3/2

sin 30 = 1/2

implementing values

1/2*√3/2-1/2*√3/2

√3/4-√3/4

= 0

LHS = RHS

HENCE PROVED.

HOPE THIS WILL HELP U.