its a homework i've been given, i think its from an edexcel past paper.
the equation is f(x) e^x - 1 - cosx, and we have to show that 0.5 < a < 0.7
i know you just have to sub 0.5 and 0.7 in as X, but when i do it using the degree mode, the answer is wrong! but when i do it using the radian mode, the answer is right. also i did another question i found off the net with cosine in the iteration, and the answer was in radian mode too, and they didn't specify that x is in the radians mode either