# Pedro123's latest activity

• Pedro123 replied to the thread Proof question help..
Here's a brief rundown, reply if you want a more detailed response. Take 3 points A, B and C. Draw lines AB and BC, labelling their...
• Pedro123 reacted to blyatman's post in the thread Definite Integral with Like.
Yes that's the definition of an integral. An integral is essentially just an infinite sum, so the upper limit of the sum needs to go to...
• In more concrete words, you are asked to show n = \cos^{-1} \frac 35, given the conditions a \cos \alpha = 1, a \cos (n+\alpha) = 5...
• Pedro123 reacted to Drdusk's post in the thread Polynomials question with Like.
Because it says P(x) is an odd polynomial. With an odd function P(x) = -P(x). It also has degree 3. You can only have a degree 3...
• Pedro123 replied to the thread Definite Integral.
Yes there is, but it's a pain to do, which is why we don't consider it compared to first principles for differentiation. I would write...
• Pedro123 reacted to blyatman's post in the thread Mean of a function with Like.
Consider this example: Suppose you have a moving object, whose velocity varies according to some velocity function v(t) between t = 0 to...