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RD Chapter 5 Trigonometric Ratios Ex 5.2 Solutions

Question - 21 : - 2sin x/2 = 1

Answer - 21 : -


Question - 22 : - √3 sin x=cos x

Answer - 22 : -


Question - 23 : - tan x = sin 45° cos 45° + sin 30°

Answer - 23 : -


Question - 24 : - √3 tan 2x = cos 60° +sin 45° cos 45°

Answer - 24 : -


Question - 25 : - cos 2x = cos 60° cos 30° + sin 60° sin 30°

Answer - 25 : -


Question - 26 : - If θ = 30°, verify that :

Answer - 26 : -


Question - 27 : -
If A = B = 60°, verify that:
(i) cos (A – B) = cos A cos B + sin A sin B
(ii) sin (A – B) = sin A cos B – cos A sin B tan A – tan B
(iii) tan (A – B) =  

Answer - 27 : -


Question - 28 : -
If A = 30° and B = 60°, verify that :
(i) sin (A + B) = sin A cos B + cos A sin B
(ii) cos (A + B) = cos A cos B – sin A sin B

Answer - 28 : -


Question - 29 : - If sin (A + B) = 1 and cos (A,-B) = 1,0° < A + B < 90°, A > B find A and B.

Answer - 29 : -


Question - 30 : -

Answer - 30 : -


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