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प्रश्न
Prove that:
sec (70° – θ) = cosec (20° + θ)
योग
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उत्तर
sec (70° – θ) = sec [90° – (20° + θ)] = cosec (20° + θ)
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अध्याय 21: Trigonometrical Identities - Exercise 21 (E) [पृष्ठ ३३२]
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