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Question
त्रिकोणमितीय फलन cot `((−15π)/4)` का मान ज्ञात कीजिए।
Sum
Solution
cot = `((−15π)/4) = "cot" ((- 15π)/4)` [∵ cot (-θ) = – cot θ]
= cot `(4π-π/4)`
= cot `(-π/4)` [∵ cot (2nπ±θ) = cot( ± θ)]
= cot `π/4` [∵ cot (-θ) = - cot θ]
= 1.
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त्रिकोणमितीय फलन - त्रिकोणमितीय फलनों के चिह्न
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