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How do I best use my knowledge for a question when the question doesn't seem relevant?

When you get into the exam, you will always have more than one option to choose from. Always take 5 minutes to read the questions carefully, select one and write a quick plan. There's no need to panic, as 5 ...
MF
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C is a circle with equation x^2 + y^2 = 16. The point P = (3,√7) is on C. Find the equation of the tangent to C at the point P.

First, we note the centre of the circle is at the origin (0,0). Then we calculate the gradient of the line OP, the line connecting the origin to P. The gradient = change in y / change in x = (√7 - 0) / (3 - ...
DC
Answered by Daniel C. • Maths tutor
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Briefly outline the multistore model of memory (6 marks)

The Multistore Memory Model was proposed by Atkinson and Shiffrin in 1968. It is made up of 3 stores: the sensory register, the short-term memory (STM) and long-term memory (LTM). Information is detected by ...
CC
Answered by Connie C. • Psychology tutor
21756 Views

Solve sec(x)^2-2*tan(x)=4 for 0<=x<=360

We know sin(x)^2+cos(x)^2=1Dividing by cos(x)^2: tan(x)^2+1=sec(x)^2Substitute into the Equation and Rearrange to get: tan(x)^2-2*tan(x)-3=0Let y = tan(x): y^2-2y-3=0Factorising: (y-3)(y+1)=0so y = 3 and y =...
MR
Answered by Mukesh R. • Maths tutor
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Explain the difference between local and global variables

The difference is the scope. A local variable can only be seen within its scope, for example a variable defined in a method can only be seen within this method. However, a global variable can be seen by ever...
PC
Answered by Peter C. • Python tutor
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