You can easily do it in the case ofIndefinite Integrationwhere you can easily differentiate the given four functions.
In the case ofSequence and Series, in most of the cases, an arbitrary value helps. If the question is based on ‘n’ then put arbitrary values of ‘n’ and verify it. If the question is related toAM-GMyou can take the limiting values i.e you can take all of them as equal.
In the case ofCoordinate Geometry, make a rough graph and mark the points or try the points given in option so as to satisfy the equation.
Same way you can do it inTrigonometry. Suppose there are two variables A and B in given question, try to put suitable known values (say A=60 and B=45) in question to reduce it to some constant, then put same values in given options one by one, whichever option matches the desired value would be the correct answer.
