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प्रश्न
Show that tan(45° − A) = `(1 - tan "A")/(1 + tan "A")`
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उत्तर
tan(45° − A) = `(tan45^circ - tan "A")/(1 + tan45^circ tan "A")`
= `(1 - tan "A")/(1 + tan "A")`
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