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a) F answer is modulus of cos x
b)F answer is √(x^2+3^2)
d)F cannot divide denominator seperately
f)F cannot divide denominator seperately
g)T e^ ln x=x
How do you know how to check all of those questions
how do you know how to check each one of the question to see if they are true or not
they are evaluated by basic formulas.
which one you have doubt?
All of them, what are the formulas
a) √(x^2) = modulus of x
b)√(x^2+9) = √(x^2+3^2) (this is not formula,9 = 3^2
we cannot simplify it further to modulus of x + 3
c) (7+a)/7 = 7/7 + a/7
= 1 + a/7
d) x/ x+y
we cannot split this denominator terms separately like numerator
that is ,we cannot write this into x/x + x/y( as we done in the above problem,in the above problem we had separated the numerator terms which is allowed,but this is not the case with denominator)
e) sin x= 2 sin (x/2 )cos (x/2)
this is a basic formula ,so it is true
f) 2/ (4+x)
this is similar case of question d
we cannot separate denominator terms into 2/4 + 2/ x = 1/2 + 2/x
so this solution is false
g)e^ ln x = x
that is e^ ln ( of any number) = that number
here e^ ln 5/2 = 5/2
so it is true
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