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Evaluate $space space limit as straight x rightwards arrow straight x over 4 of fraction numerator cos space straight x space minus space sin space straight x over denominator straight x minus straight pi divided by 4 end fraction.$

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22.

Evaluate $space space space space space limit as straight x rightwards arrow straight pi of fraction numerator sin left parenthesis straight n minus straight pi right parenthesis over denominator straight pi left parenthesis straight pi minus straight x right parenthesis end fraction.$

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23.

Evaluate $space space space space space space space space space space space space limit as straight x rightwards arrow 0 of fraction numerator sin space space ax plus bx over denominator ax plus sin space bx end fraction comma space straight a comma space space straight b comma space straight a plus straight b not equal to 0$

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24.

Evaluate $space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space limit as straight x rightwards arrow 0 of left parenthesis cosec space straight x minus cot space straight x right parenthesis$

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25. Find the derivative of x²-2 at x = 10.

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26. Find the derivative of f (x) = 7 at x = 3

f(3) $space space space space space space space space space space space space space space space equals space limit as h rightwards arrow 0 of fraction numerator f left parenthesis 3 plus h right parenthesis minus left parenthesis 3 right parenthesis over denominator h end fraction equals limit as h rightwards arrow 0 of fraction numerator 7 minus 7 over denominator h end fraction equals limit as h rightwards arrow 0 of 0 equals 0$