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Expresss each of the following in terms ...

Expresss each of the following in terms of T-ratios of angles lying between `0^theta and 45^@`.
(i) `sin 67^@+cos 75^@`
(ii) ` cot 65^@+tan 49^@`
(iii) ` sec 78^@+cosec 56^@`
(iv) `cosec 54^@+sin 72^@`.

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