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प्रश्न
Choose the correct alternative:
`tan^-1 (1/4) + tan^-1 (2/9)` is equal to
विकल्प
`1/2 cos^-1 (3/5)`
`1/2 sin^-1 (3/5)`
`1/2 tan^-1 (3/5)`
`tan^-1 (1/2)`
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उत्तर
`tan^-1 (1/2)`
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