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A: Firstly to add fractions the denominators have to be the same. For example, 3/7 + 2/3 firstly you need to work out the lcm of 7 and 3, in this case it is 21. So each fraction needs to be put into the form...

From the double angle formula for cosine, we know that cos(2x)=cos 2 (x)-sin 2 (x). Also, we know that sin 2 (x)+cos 2 (x)=1. So by substituting the second formula into the first, we can say that cos(2x)=(1-...

(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...