Question

what is the answer.NO SPAMMING. ONLY correct answer ​

Answer 1

This a video for the equation by blackpenredpen: h t t p s : / / w w w . y o u    t u b e . c o m / w a t c h ? v  = m N N V x - Q 8 Y i c

Here is another video by blackpenredpen showing an easier method:

h t t p s  : /  / w w w .y o u t u b e .  c o m/  w a t c h ? v = m N N V x - Q 8 Y i c

I don't know the answer but this guy explains very well so I wanted to recommend him to you. His videos might even come handy afterwards for some other problem.

You can delete my answer after copying the link and watching the video.

Hope it helps :)