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How do i memorize all the essays that could come up on the exam?

The method of memorization has to be done via you figuring out a way to commit information to your memory, whether that be via writing them out repeatedly, condensing the essay into main points which you can...
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Answered by Maryam A. • Psychology tutor
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A table has diameter 130cm. What is the area, as a multiple of Pi

Since the diameter is 130cm, the radius is half of this, so it is 65cm Area is Pi radius 2 . This means the area is Pi (65cm) 2 This means the area is Pi*4225cm 2
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Answered by Jesse P. • Maths tutor
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When is the inequality x^4 < 8x^2 + 9 true?

If we consider this like a normal quadratic problem, this becomes easy x 4 &lt; 8x 2 + 9 x 4 - 8x 2 - 9 &lt; 0 (x 2 -9)(x 2 +1) &lt; 0 This means there are roots of this expression at x 2 = 9 and x 2 = -1 Si...
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Answered by Jesse P. • MAT tutor
4258 Views

Why does e^ix = cos(x) + isin(x)

If you look at the Taylor series expansion of e x: e x = 1 + x + x 2 /(2!) + x 3 /(3!) + x 4 /(4!)... If you then make this e ix , you get 1+ix - x 2 /(2!) - ix 3 /(3!) + x 4 /(4!)... If we split this into r...
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8007 Views

How does the product rule for differentiation work

The chain rule works so that if you have y=f(x)g(x), where f(x) and g(x) are functions of x, dy/dx = f'(x)g(x) + f(x)g'(x)
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Answered by Jesse P. • Maths tutor
5004 Views