finding critical points

[fluid mason]

y = sinx(1+cosx) find critical points

[loud viper]

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[cursive loom]

Looks smooth. How's the derivative coming about?

[void elbow]

critical point for a differentiable function is whereever derivative = 0, get to it!

[fluid mason]

I know that

[fluid mason]

Cosx + cos2x

[cursive loom]

Now find where it vanishes

[fluid mason]

How to find x for which this is 0

I can't do

[void elbow]

$$ 2\cos ^2x +\cos x - 1 = 0 $$

[ruby shale]

aL

[void elbow]

look familiar?

, rotate

[fluid mason]

Oh

It's a quadratic

[void elbow]

🙂

[fluid mason]

I got it

Thanks buddy!!

Bro is this function have any minimum value??

[void elbow]

what function is this

[fluid mason]

I have written

Left side of diagram

[void elbow]

oh it's a different problem?

[fluid mason]

Yah

[void elbow]

close this one if you have it solved, then

and open a new one

[fluid mason]

But i wanna know

I will close after this

[void elbow]

minimum doesn't exist

[fluid mason]

Is -∞ is the minimum value? Or no minimum value

[fluid mason]

Why not negative infinity?

[void elbow]

not a real number

[fluid mason]

Oh oki

+close