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2 questions can someone help me with... working please so I can understand what you have done help appreciated

7. Given that u=(x/2)-(1/8 sin4x)

show that du/dx= sin^2 2x

8. A circular stain grows in such a way that the rate of increase of its radius is inversely proportional to the square of the radius. Given that the area of the stain at t seconds is A cucib centimeteres squared.

show that dA/dT is proportional to 1/(A^0.5)

please help!!!!

7. Given that u=(x/2)-(1/8 sin4x)

show that du/dx= sin^2 2x

8. A circular stain grows in such a way that the rate of increase of its radius is inversely proportional to the square of the radius. Given that the area of the stain at t seconds is A cucib centimeteres squared.

show that dA/dT is proportional to 1/(A^0.5)

please help!!!!

madad69_81

2 questions can someone help me with... working please so I can understand what you have done help appreciated

7. Given that u=(x/2)-(1/8 sin4x)

show that du/dx= sin^2 2x

7. Given that u=(x/2)-(1/8 sin4x)

show that du/dx= sin^2 2x

u=(x/2)-(1/8)(sin4x)

du/dx= ½ - (1/8)(4cos4x)

.......= ½- ½cos4x

.......= ½ - ½(1-2sin²2x)

.......=½ -½ + sin²2x

.......=sin²2x

Q.E.D

- Edexcel A2 Mathematics: Core Mathematics C4 6666 01 - 22 June 2018 [Exam Discussion]
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- Econ+Maths joint honours, or straight Econ?
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- A-Level Music Technology 2023
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- Differentiation
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- Differentiation
- Maclaurin Series Question
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can someone please explain what principle domain is and why the answer is a not c?Maths

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