Let f(x)=3x10−7x8+5x6−21x3+3x2−7 , then 265(limh→0h4+3h2[f(1−h)−f(1)]sin5h)=

265[limh→0h2+3(f(1−h)−f(1)−h)(sin5hh)]=−265×3f'(1).5=53×3f'(1) =−53×3−53 [∵f'(1)=−53]=3

Let f(x)=3x10−7x8+5x6−21x3+3x2−7 , then 265(limh→0h4+3h2[f(1−h)−f(1)]sin5h)=

265[limh→0h2+3(f(1−h)−f(1)−h)(sin5hh)]=−265×3f'(1).5=53×3f'(1) =−53×3−53 [∵f'(1)=−53]=3

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Let $f (x) = 3 x^{10} - 7 x^{8} + 5 x^{6} - 21 x^{3} + 3 x^{2} - 7$ , then $265 (\lim_{h \to 0} \frac{h^{4} + 3 h^{2}}{[f (1 - h) - f (1)] \sin 5 h}) =$

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$265 [\lim_{h \to 0} \frac{h^{2} + 3}{(\frac{f (1 - h) - f (1)}{- h}) (\frac{\sin 5 h}{h})}] = - 265 \times \frac{3}{f' (1) .5} = \frac{53 \times 3}{f' (1)} = - \frac{53 \times 3}{- 53} [∵ f' (1) = - 53] = 3$

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Let f(x)=3x10−7x8+5x6−21x3+3x2−7 , then 265(limh→0h4+3h2[f(1−h)−f(1)]sin5h)=

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Let $f (x) = 3 x^{10} - 7 x^{8} + 5 x^{6} - 21 x^{3} + 3 x^{2} - 7$ , then $265 (\lim_{h \to 0} \frac{h^{4} + 3 h^{2}}{[f (1 - h) - f (1)] \sin 5 h}) =$