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Without using trigonometric tables, eval...

Without using trigonometric tables, evaluate each of the following :
(i) ` sin^2 65^@+sin^2 25^@`
(ii) ` cos^2 17^@- sin^2 73^@`
(iii) ` cosec ^2 67^@-tan^223^@`
(iv) ` sec^2 36^@-cot ^2 54^@`.

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