00:01
Now, given that f of x is equal to cos x.
00:07
According to taylor series expansion, f of z at a point 0, f of z at a point z0, then f of x is equal to f of 0, f of 0 plus x minus 0 f dash x, f dash x naught plus x minus 0 square divided by 2 factorial f double dash x naught plus x cube divided by 3 factorial f triple dash x naught plus x4 divided by 4 factorial f dash dash dash x naught plus x to power 5 divided by 5 factorial f dash dash dash dash dash x naught.
01:08
Now, f of x is equal to cos x.
01:13
Now, f of 0 is equal to cos 0, this is equal to 1, f dash x is equal to, f dash is equal to minus sin x.
01:25
So, f dash 0 is equal to 0.
01:28
Now, f double dash x, f double dash x is equal to minus cos x.
01:34
Now, this is equal to, f double dash 0 is equal to minus 1.
01:38
Now, f triple dash is equal to minus plus sin x.
01:48
Now, f dash dash 0 is equal to 0.
01:53
Now, f dash dash dash x is equal to cos x...