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Differentiate y =cos^4(x)

Let u = cos xdu/dx = -sin xy = u 4 dy/du = 4u 3 dy/dx = dy/du * du/dx = (4u 3 ) * (-sin x) = 4 cos 3 x * -sin x = -4 cos 3 x sin x
CK
Answered by Christiyan K. • Maths tutor
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How do I know what content will appear on my HAT question 2 when I'm not studying the same periods as anybody else?

The university specifically designs the HAT to ensure that anybody who does some form of history can answer it. Section two on the paper will be deliberately open, so you don't have to worry about knowing a ...
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Answered by Evie L. • HAT tutor
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How do I apply mathematical induction to answer questions

If you are familiar with induction but unsure how to answer the types of questions that require it, a structure can be useful. Even when confident, it will help an examiner to see where to award you marks if...
OM
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factorise and hence solve x^2 + 10x +18 = -3

x = -3 , x= -7
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Answered by Billy W. • Maths tutor
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solve the following simultaneous equations 4x + 6y = 16 and x + 2y = 5

x = 1, y = 2
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Answered by Billy W. • Maths tutor
4526 Views