\(\frac{{\cos 20^\circ }}{{\sin 70^\circ }}\) + \(\frac{{\cos\theta }}{{{\rm{sin}}\left( {90^\circ - \theta } \right)}}\) = _______.

Question

Question

This question was previously asked in

SSC CGL 2022 Tier-I Official Paper (Held On : 06 Dec 2022 Shift 1)

Answer 1

অনুসৃত ধারণা:

sin(90 - θ) = cosθ

গণনা:

⇒ \(\dfrac{{\cos 20^\circ }}{{\sin 70^\circ }}\) = \(\dfrac{{\sin(90^\circ-20^\circ) }}{{\sin 70^\circ }}\) = 1

\(\dfrac{{\cos\theta }}{{{\rm{sin}}\left( {90^\circ - \theta } \right)}}\) \(\dfrac{{\cos\theta }}{{{\cos\theta}}}\) = 1

⇒ 1 + 1 = 2

∴ সঠিক বিকল্পটি হল 2

Download Solution PDF