1.

यदि \( \sin \theta+\operatorname{cosec} \theta=2 \), तो \( \sin ^{10} \theta+\operatorname{cosec}^{10} \theta \) का मान होगा

Answer» Solution:

Given,

sin θ + cosec θ = 2

sin θ + (1/sin θ) – 2 = 0

sin2θ + 1 – 2 sin θ = 0

(sin θ – 1)2 = 0

sin θ – 1 = 0

sin θ = 1

cosec θ = 1/sin θ = 1

sin10θ + cosec10θ 
= (1)10 + (1)10 
= 1 + 1 = 2

sin θ + cosec θ = 2

= sin θ + \(\cfrac1{sin\,θ}\) = 2

sin2 θ + 1 = 2 sin θ

= sinθ - 2sin θ + 1 = 0

= (sin θ - 1)2 = 0

= sin θ - 1 = 0

= sin θ = 1

\(\therefore\) cosec θ = \(\cfrac1{sin\,θ}\) = \(\cfrac1{1}\) = 1

sin10 θ + cosec10 θ = 110 + 110 = 1 + 1 = 2



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