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cos(2y)= (cos(y))^2 - (sin(y))^2 identitynow consider identity (cos(y))^2+(sin(y))^2=1by rearranging this to (cos(y))^2 - 1 = - (sin(y))^2 we can now substitute it into our first identity to obtaincos(2y)...

This is an equation laid out in terms of the natural logarithm, which essentially is the reverse function of e^x . From this equation we need to find a solution for x =? Since we know that this ...

y=3x⁴-8x³-3
Let's say we want to calculate dy/dx. For a term Axⁿ, the differential with respect to x is Anx^n-1. For a constant value, we can say t...

First, straight away from reading the question you know this question will involve differentiating the function with respect to x so immediately you want to re-write the equation in terms of y which in th...

u = ln (x+1) v = sin x
du/dx = 1/(x+1) dv/dx = cos x
Therefore, by the product rule,
dy/dx = [sin x / x+1] + [ln (x+1) cos x]