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प्रश्न
Evaluate: Cosec (65 + θ) – sec (25 – θ) – tan (55 – θ) + cot (35 + θ)
उत्तर
cosec (65 + θ) = sec (90 – (65 + θ)) = sec (25 – θ)
tan (55 – θ) = cot (90 – (55 – θ) = cot (35 + θ)
⇒ sec (25 – θ) – sec (25 – θ) tan (55 – θ) + tan (55 – θ) = 0
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