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Prerequisite for addition formula: https://www.youtube.com/watch?v=iHZmi2MHqWc Proof of formula for sin(A+B): https://www.youtube.com/watch?v=BEETggUVMrY Proof of formula for cos(A+B): https://www.youtube.co...
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Answered by Sam G. • Maths tutor
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What is homeostasis?

Homeostasis is defined as the maintenance of a constant internal environment in the body. An example of this would be the blood glucose level: After a meal, a person's blood glucose level would be high. This...
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Answered by Lauren S. • Biology tutor
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How do I know how many roots a quadratic equation has?

Let ax 2 + bx + c = 0 be the equation in question where a,b,c are real numbers with a not equal to 0 (otherwise we would not have a quadratic). If: b 2 - 4ac > 0 then there are two (real) roots b 2 - 4ac ...
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Answered by Amit G. • Maths tutor
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What is the difference between descriptive and analytical writing? Which is better?

In order to break into the top bands in any GCSE literature essay, a student must write analytically, not descriptively. Rather than merely detailing what has happened in a story, one should strive to explai...
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Answered by Nicholas O. • English tutor
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How do you differentiate (3x+cos(x))(2+4sin(3x))?

Here we have a product of two things, so we will be using the product rule of differentiation. This is: for y=u(x)v(x), where u(x) and v(x) are funtions of x, dy/dx = u'(x)v(x) + u(x)v'(x). So in this case l...
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Answered by Jaisal P. • Maths tutor
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