Do you mean to the nearest ten? If so, then it would be 60. Look to the right of the number you are to round, if it's 5 or more then round up. If it's 4 or less then round down. If it's a zero, then do nothing. The numbers following the one you are rounding get changed to zero's.
We will simplify the left hand side of the equation to look like the right
![\displaystyle \frac{1-sin(t)}{cos^{2}(t)} + \frac{1}{1 - sin(t)}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B1-sin%28t%29%7D%7Bcos%5E%7B2%7D%28t%29%7D%20%20%2B%20%5Cfrac%7B1%7D%7B1%20-%20sin%28t%29%7D)
taking the LCM
![\displaystyle \frac{[1-sin(t)]^{2} + cos^{2}(t)}{[cos^{2}(t)][1 - sin(t)]}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B%5B1-sin%28t%29%5D%5E%7B2%7D%20%2B%20cos%5E%7B2%7D%28t%29%7D%7B%5Bcos%5E%7B2%7D%28t%29%5D%5B1%20-%20sin%28t%29%5D%7D)
expanding the binomial in the numerator
![\displaystyle \frac{[1 + sin^{2}(t) - 2sin(t) + cos^{2}(t)]}{[cos^{2}(t)][1 - sin(t)]}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B%5B1%20%2B%20sin%5E%7B2%7D%28t%29%20-%202sin%28t%29%20%2B%20cos%5E%7B2%7D%28t%29%5D%7D%7B%5Bcos%5E%7B2%7D%28t%29%5D%5B1%20-%20sin%28t%29%5D%7D)
Since sin²x + cos²x = 1
![\displaystyle \frac{[2 - 2sin(t)]}{[cos^{2}(t)][1 - sin(t)]}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B%5B2%20-%202sin%28t%29%5D%7D%7B%5Bcos%5E%7B2%7D%28t%29%5D%5B1%20-%20sin%28t%29%5D%7D)
factoring out the 2 from the numerator
![\displaystyle \frac{2[1 - sin(t)]}{[cos^{2}(t)][1 - sin(t)]}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B2%5B1%20-%20sin%28t%29%5D%7D%7B%5Bcos%5E%7B2%7D%28t%29%5D%5B1%20-%20sin%28t%29%5D%7D)
1-sin(t) will cancel out
![\displaystyle \frac{2}{cos^{2}(t)}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cfrac%7B2%7D%7Bcos%5E%7B2%7D%28t%29%7D)
since cos²(t) = 1/(sec²(t))
![2 sec^{2}(t)](https://tex.z-dn.net/?f=2%20sec%5E%7B2%7D%28t%29)
which is equal to the right hand side of our given equation.
So we verified the identity!
Just subtract each term from the next term.
So:
2nd term minus 1st term = 0.26 - 0.36 = -0.1
3rd term minus 2nd term = 0.16 - 0.26 = -0.1
etc
So common difference is -0.1
Yes you can see the answer but you might need to watch an ad first then it will show you the answer
9.9 squared is close to 10 squared therefore it is 100
100×1.79= 179