Random Picture Thread Vers.4

One for the mathematicians amongst you. Euler's Identity is often described as maths most beautiful equation.

 

Had to google that only to find it can also =-1
Brain fried.

 

And to really freak you out - 'i' in that formula is the square root of -1 which cannot mathematically exist so is an 'imaginary' number.

 

My brain stops at double differentiation

 

Algebra really is word soup, or number soup if you like