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شائع الجبر >

expand (-(piL^2(90-arccos(2/L)))/(360)-4)^2

الحلّ

expand

(- \frac{π L ^{2} ( 90 - arccos ( \frac{2}{L} ) )}{360} - 4)^{2}

الحلّ

\frac{π ^{2} L ^{4}}{16} - \frac{π ^{2} L ^{4} arccos ( \frac{2}{L} )}{720} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + 2 π L^{2} - \frac{π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

خطوات الحلّ

(- \frac{π L ^{2} ( 90 - arccos ( \frac{2}{L} ) )}{360} - 4)^{2}

π L^{2} (90 - arccos (\frac{2}{L}))

وسٌع:

90 π L^{2} - π L^{2} arccos (\frac{2}{L})

= (- \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{360} - 4)^{2}

(a - b)^{2} = a^{2} - 2 ab + b^{2}

:فعّل صيغة الضرب المختصر

a = - \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{360}, b = 4

= (- \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{360})^{2} - 2 (- \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{360}) \cdot 4 + 4^{2}

(- \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{360})^{2} - 2 (- \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{360}) \cdot 4 + 4^{2}

بسّط:

\frac{8100 π ^{2} L ^{4} - 180 π ^{2} L ^{4} arccos ( \frac{2}{L} ) + π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

= \frac{8100 π ^{2} L ^{4} - 180 π ^{2} L ^{4} arccos ( \frac{2}{L} ) + π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

: استخدم ميزات الكسور التالية

\frac{8100 π ^{2} L ^{4} - 180 π ^{2} L ^{4} arccos ( \frac{2}{L} ) + π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} = \frac{8100 π ^{2} L ^{4}}{129600} - \frac{180 π ^{2} L ^{4} arccos ( \frac{2}{L} )}{129600} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600}

= \frac{8100 π ^{2} L ^{4}}{129600} - \frac{180 π ^{2} L ^{4} arccos ( \frac{2}{L} )}{129600} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + \frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

: استخدم ميزات الكسور التالية

\frac{90 π L ^{2} - π L ^{2} arccos ( \frac{2}{L} )}{45} = \frac{90 π L ^{2}}{45} - \frac{π L ^{2} arccos ( \frac{2}{L} )}{45}

= \frac{8100 π ^{2} L ^{4}}{129600} - \frac{180 π ^{2} L ^{4} arccos ( \frac{2}{L} )}{129600} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + \frac{90 π L ^{2}}{45} - \frac{π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

\frac{8100 π ^{2} L ^{4}}{129600}

اختزل:

\frac{π ^{2} L ^{4}}{16}

= \frac{π ^{2} L ^{4}}{16} - \frac{180 π ^{2} L ^{4} arccos ( \frac{2}{L} )}{129600} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + \frac{90 π L ^{2}}{45} - \frac{π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

\frac{180 π ^{2} L ^{4} arccos ( \frac{2}{L} )}{129600}

اختزل:

\frac{π ^{2} L ^{4} arccos ( \frac{2}{L} )}{720}

= \frac{π ^{2} L ^{4}}{16} - \frac{π ^{2} L ^{4} arccos ( \frac{2}{L} )}{720} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + \frac{90 π L ^{2}}{45} - \frac{π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

\frac{90}{45} = 2 :

اقسم الأعداد

= \frac{π ^{2} L ^{4}}{16} - \frac{π ^{2} L ^{4} arccos ( \frac{2}{L} )}{720} + \frac{π ^{2} L ^{4} arccos ^{2} ( \frac{2}{L} )}{129600} + 2 π L^{2} - \frac{π L ^{2} arccos ( \frac{2}{L} )}{45} + 16

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