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निम्नलिखित त्रिकोणमितीय अनुपातो के मान ज...

निम्नलिखित त्रिकोणमितीय अनुपातो के मान ज्ञात कीजिए :
`(a) cos (-1760^(@)) " "(b) sin (-780^(@))`
`(c ) cos (-1125^(@)) " " (d) cot (-(15pi)/(4))`
` (e ) sin 765^(@) " "(f ) "cosec "(-1410^(@))`

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