Question

निम्न में x का मान ज्ञात कीजिए:
(1) cos x = cos 60° cos 30° + sin 60° sin 30°​

Answer 1

Answer:

x = 30°

cos x = cos 60° cos 30° + sin 60° sin 30°

cos x = 1/2 × √3/2 + √3/2 × 1/2

cos x = √3/4 + √3/4

cos x = 2√3/4

cos x = √3/2

As we know that, cos 30° = √3/2

Thus, x = 30°