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From the double angle formula for cosine, we know that cos(2x)=cos2(x)-sin2(x). Also, we know that sin2(x)+cos2(x)=1. So by substituting the second formula ...
(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 33 =9...
The stationary point of a curve is where it changes direction, that is the gradient goes from pos...
First, remember the compound angle formula for cosine:
Recall that a geometric progression is a sequence (a_n) defined ...
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