प्रश्न- COS20°.COS40°.COS80° का मान ज्ञात कीजिए?
Question- Find the Value of COS20°.COS40°.COS80° [RRC GROUP D 2022 exam]
Option is A) 1/2 B) 1/4 C) 1/8 D) 1/16
Solution - COS20°.COS40°.COS80° =? Equ.(i)
We Know COS (60-X). COS (60+X). COS X = 1/4 COS 3 X
Putting X = 20 Degree
COS (60-20). COS (60+20). COS 20 = 1/4 COS 3 .20
COS40°. COS80°. COS20° = 1/4 COS60° equ.(ii)
Equation (ii) Value put in equation (i) We get
1/4 COS60°
We know COS60° = 1/2
Therefor 1/4 . 1/2 = 1/8 Answer.
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More Questions :-
Q-1 COS20°.COS40°.COS80° का मान ज्ञात कीजिए?
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