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Find the integral of tan^2x dx

You can not integrate tan 2 x but you can integrate sec 2 x Since sec 2 x = 1 + tan 2 x Then tan 2 x = sec 2 x-1 so the intragral of tan 2 x dx = the integral of (sec 2 x-1) dx = intrgral of sec 2 x dx + int...
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Answered by Nandini P. • Maths tutor
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Find the determinant of a 3x3 square matrix

We can expand following any row or column we want. A wise choice would be to use a row/column in which we have one or more zero entries to reduce the calculations. From this, we pick the first entry on the c...
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How do I solve a problem about a mass on a slide?

It is good practice in physics to draw a diagram of the situation, so the first thing we want to do is create a picture of the problem, focussing on the object on the slide. Now we need to analyse what is ha...
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Answered by Stefano Z. • Physics tutor
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Explain how fair trade may benefit producers in the developing world. (4 marks)

Fair trade farmers receive a guaranteed price for their produce (e.g. cocoa, bananas) therefore they have higher and more secure income in comparison to non-fair trade. This is beneficial for producers as it...
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Answered by Nayha** P. • Geography tutor
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Research often uses laboratory experiments. Outline one weakness and one strength of this method.

A strength of this method of experimenting is that it is scientific. This is because the variables of the experiment are strictly controlled during a laboratory experiment, which further means that cause and...
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Answered by Erin W. • Psychology tutor
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