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प्रश्न
Choose the correct alternative:
`sin^-1 3/5 - cos^-1 13/13 + sec^-1 5/3 - "cosec"^-1 13/12` is equal to
विकल्प
`2pi`
`pi`
0
`tan^-1 12/65`
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उत्तर
0
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