# Recent content by rishi kesh

1. ### I Why tan x=x as x approaches 0?

Thanks for that
2. ### I Why tan x=x as x approaches 0?

This is the explanation i actually needed. But i want you to extend it a little bit, hopefully you will clear my doubt(please check my attachment). I will appreciate further reply from you :)
3. ### I Why tan x=x as x approaches 0?

But why is it true for radians only? I solved on my calculator and this is what i saw : Tan (0.12) = 0.12 (where 0.12 is radians) But when x is in degrees Tan(0.12) = 0.00209 What is happening here?please explain.
4. ### I Why tan x=x as x approaches 0?

Hi! In one of my textbook i saw the relation tan(x) = x where x is very small value and expressed in radians. I want to know why its true and how it actually works. I would appreciate someone's help :smile:
5. ### Lorentz force and linear motors

I have a picture below please have a look at it. The guy is using two conducting rods placed parallel to each other and placed below it are magnets. When battey is connected to rods and a conductor is placed over them it starts to move.That works according to flemmings left hand rule. I was...
6. ### Derivative of -x using first principle

Hey! I think i got it! When, f(x)= x^2 f(x+h)= (x+h)^2 If, f(x)= -x f(x+h)= -(x+h) = -x-h Is this right?
7. ### Derivative of -x using first principle

But how does that work? Why it isn't -x+h ?:oldconfused:
8. ### Derivative of -x using first principle

Homework Statement This is a silly question,but i have a problem.How do we solve derivative of -x using first principle of derivative. I know that if derivative of x w.r.t x is 1 then ofcourse that of -x should be -1. Also it can be solved by product rule taking derivative of -1.x . Homework...
9. ### How to find the derivative of this function

Here is a picture of what i've solve. Please tell me if its correct.
10. ### How to find the derivative of this function

Hi! I am sorry i tried but i couldn't solve it . I would greatly appreciate your help.