Question

if cos x is equal to Cos 60 degree cos 30 degree + sin 60 degree sin 30 degree find the value of x​

Answer 1

(i) cos x = cos 60° cos 30° + sin 60° sin 30° cos x = cos 30° x = 30° (ii) sin 2x = sin 60° cos 30° – cos 60° sin 30° ⇒ sin 2x = 1/2 = sin 30° ⇒ 2x = 30° ⇒ x = 15°Read more on Sarthaks.com - https://www.sarthaks.com/751665/find-the-value-of-x-in-the-following-i-cos-x-cos-60-cos-30-sin-60-sin-30

Answer 2

ANSWER:-

1/2 ×√3/2 +√3/2 ×1/2 = √3/4 +√3/4

2√3/4 =√3/4 = cos 30°

cos x = cos 30°

x = 30°

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