Prove that cos(4x) = 8(cos^4(x))-8(cos^2(x)) + 1
cos(4x) = cos(2(2x)) = 2(cos^2(2x)) - 1 = 2 (cos^2(x) - 1)^2 - 1 = 8(cos^4(x)) - 8(cos^2(x)) + 1
HT
Related Maths A Level answers
All answers ▸Integrate the following expression with respect to x, (2+4x^3)/x^2
Integrate ∫x^4+5x^3+sin(2x) dx
Find the values of x and y for which dy/dx = 0 in y= x^3 - 4x^2 - 3x +2
A curve C has equation y=(2x-3)^5. Find the equation of the normal of this curve at point P with y coordinate -32.