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Question
सिद्ध कीजिए: tan2 θ + cot2 θ + 2 = sec2 θ cosec2 θ
Theorem
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Solution
सिद्ध करना है:
tan2 θ + cot2 θ + 2 = sec2 θ cosec2 θ
बाएँ पक्ष:
tan2 θ + cot2 θ + 2
ध्यान दें:
tan2 θ + cot2 θ + 2 = (tan θ + cot θ)2
अब,
tan θ + cot θ = `(sin theta)/(cos theta) + (cos theta)/(sin theta) = (sin^2 theta + cos^2 theta)/(sin theta cos theta) = 1/(sin theta cos theta)`
तो,
(tan θ + cot θ)2 = `1/(sin^2 theta cos^2 theta)`
दाएँ पक्ष:
sec2 θ cosec2 θ = `1/(cos^2 theta) · 1/(sin^2 theta) = 1/(sin^2 theta cos^2 theta)`
दोनों पक्ष बराबर हैं।
अतः सिद्ध हुआ की:
tan2 θ + cot2 θ + 2 = sec2 θ cosec2 θ
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