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(3* square root of 2) square= (3* square root of 2) * (3* square root of 2) now lets remove the brackets remember to multiply the number outside the square root; so gives us 3 3 =9 and then multiplythe numbe...

The stationary point of a curve is where it changes direction, that is the gradient goes from positive to negative or vice versa. At the exact point of the change, the gradient of the curve will be exactly 0...

The cosine rule is used to find the length of a side or size of an angle. Take a look at the triangle below: For this triangle we have sides a, b and c and angles A,B and C. For this triangle the cosine rule...

You will be presented with two equations, both with two unknown values. For example: 8x-2y=19 and 3x=5+y To begin, we are going to move both unknown terms in the second equation to the same side: 3x-y=5 Then...

First, remember the compound angle formula for cosine: cos (2x) =cos^ 2 (x)-sin^ 2 (x). Now use the identity sin^ 2 (x)+cos^ 2 (x)= 1 to give : cos (2x) =(1-sin^ 2 (x))-sin^ 2 (x)=1 -2sin^ 2 (x) Rearranging ...