Swapnil Saxena
Last Activity: 13 Years ago
For this situatiuon , It is always either greater than 0 or equal to 0 because
Log(2+sin(2x)) ==> the least value that the sin (2x) can take is (-1) which will make the function log(1)=0.So the least value of this function is 0. So Log(2+sin(2x)) will always take positive values
(x4+x2+1) ==> It is quite evident that (x4+x2+1) can never take negative values because x4 and x2 always take positive values for all x
esin(x) ==> The least value that this function can take when sin(x) is -1 = (1/e) which is also a positive quantity.
So If all the individual functions always return positive quantities Then the function can neer take negative values so it must be >0