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Evaluate the following: sin39^0-cos51^0 ...

Evaluate the following: `sin39^0-cos51^0` (ii) `cos e c25^0-sec65^0` `cot34^0-tan56^0` (iv) `(sin36^0)/(cos54^0)-(sin54^0)/(cos36^0)` `cos^2 13^0-sin^2 77^0`

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Evaluate the following: (i) sin39^0-cos51^0 (ii) cos e c25^0-sec65^0 +cot34^0-tan56^0 (iii) (sin36^0)/(cos54^0)-(sin54^0)/(cos36^0) +cos^2 13^0-sin^2 77^0

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