(i) यदि A + B = 90^(@), sin A = a , sin ...

(i) यदि `A + B = 90^(@), sin A = a , sin B = b `,तो सिद्ध कीजिए कि-
(a) ` a^(2) +b^(2) =1 " "(b) tan A = a/b`
(ii) दिखायें कि `sin (50^(@) + theta) - cos (40^(@) - theta) = 0`.

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