Question

If cos x = cos60° cos30° + sin 60° sin30° , then find the value of x

Answer 1

cos 60 is 1/2
cos30 is √3/2
sin60 is √3/2
sin30 is 1/2

so cos60 × cos 30 + sin60 × sin30 = 2×(√3/4)= √3/2
cosx = √3/2
therefore x = 60

Answer 2

Answer:

Step-by-step explanation:

cos 60 is 1/2

cos30 is √3/2

sin60 is √3/2

sin30 is 1/2

so cos60 × cos 30 + sin60 × sin30 = 2×(√3/4)= √3/2

cosx = √3/2

therefore x = 60