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f(x) = 5cos(x) + 4sin(x)to find f^,(x) this is just another notation for the derivative.To differentiate trigonometry I always use this one simple trick which I will show on th...

This is a quadratic inequality, because we have an x² term, so we answer this question by examining the graph of the associated equation y = x² - 9, and then find out where this grap...

if 7/9 = 0.777777 then 0.0777777 must be equal to 7/90 as it is a tenth of the original number. 0.2= (2/10)(7/90) + (2/10) = 0.27777777 find the lowest common multiple: 90, then make the denominators of e...

Firstly, let's begin by rearranging the second equation so that we can get y on its own. Therefore we will get, y = 3x +13. Through substitution, we can do this:x²+ (3x +13)²= 25 . (...

Firstly, to find the stationary points of a curve you must differentiate the equation of the curve. To do this each x component is multiplied by its current power and then the power is decreased by one. A...