sin θ + cosec θ =  எனில், sin 3 θ + cosec 3 θ = ___________ இன் மதிப்பு.

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SSC CGL 2023 Tier-I Official Paper (Held On: 24 Jul 2023 Shift 3)
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PYST 1: SSC CGL - General Awareness (Held On : 20 April 2022 Shift 2)
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கொடுக்கப்பட்டது:

sin θ + cosec θ = √5

பயன்படுத்தப்பட்ட கருத்து:

x 3 + 1/x 3 = (x + 1/x) 3 - 3(x + 1/x)

கணக்கீடு:

sin θ + cosec θ = √5

⇒ sin θ + 1/sin θ = √5

இப்போது,

sin3 θ + 1/sin3 θ = (√5)3 - 3(√5)

⇒ 5√5 - 3√5 = 2√5

∴ தேவையான பதில் 2 √5.

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