1.

Let `f(theta)=1/(1+(ottheta)^x)and S=sum_(theta=1^@)^(89^@) f(theta)`, then the value of `sqrt5` is _________ .

Answer» Correct Answer - 44.5
We have ,`f(theta)=((sintheta)^x)/((costheta)^x+(sintheta)^x)`
`rArr f(theta)+f(pi/2-theta)=1`.
`:. S=underset(theta=1^@)overset(89^@)sumf(theta)=f(1^@)+f(2^@)+...+f(88^@)+f(89^@)`
`=(ubrace(1+1+1+.........+1)_("44 times"))+1/2=44+1/2=89/2`


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