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How do I find the cartesian equation for a curve written in parametric form?

Reminder - a cartesian equation is written in terms of x and y (e.g. y = 2x + 3) while parametric equations are written with x and y separately in terms of t. Example: Find the cartesian equation of the curv...
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Answered by Alexis O. • Maths tutor
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How do I predict the shape and bond angle of an molecule?

Electron pairs arrange themselves so they are as far apart as possible (electron pair repulsion theory). In a covalent compound, the number of electron pairs around the central atom determines the shape of t...
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Answered by Tolu T. • Chemistry tutor
17043 Views

Was the Cold War in fact 'cold'?

The war that took place between 1945 and 1991 has been termed the 'Cold War', largely due to the fact that the two main agitators (The Soviet Union and The United States of America) never came into direct co...
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Answered by Imogen S. • History tutor
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Finding stationary points

Finding stationary points. You can find stationary points on a curve by differentiating the equation of the curve and finding the points at which the gradient function is equal to 0. One way of determining a...
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Answered by Jessica F. • Maths tutor
15218 Views

When do I use a cosine rule over a sine rule?

Both the sine and the consine rule applies to any triangle, you do not necessary need a right angle! You can usually use the cosine rule when you are given two sides and the included angle (SAS) or when you ...
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Answered by Jessica F. • Maths tutor
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