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Use differentials to find cos61^@, it be...

Use differentials to find `cos61^@`, it being given that `sin60^@ = 0.86603` and `1^@ = 0.01745` radian.

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MODERN PUBLICATION-APPLICATION OF DERIVATIVES-EXERCISE
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  4. If y = x^4-10 and if x changes form 2 to 1.99, what is approximate cha...

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  15. Find the maximum or minimum values, if any, of the following functions...

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  17. Find the maximum or minimum values, if any, of the following functions...

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