Question:`(p^2 + q^2) - (p^2 - q^2)` = কত ? 

A `2p^2` 
B `-2q^2` 
C `2q^2` 
D `-q^2 - q^2` 

+ Answer
C 

+ Explanation
`(p^2 + q^2) - (p^2 - q^2)`

            `= p^2 + q^2 - p^2 + q^2`

            `= p^2 - p^2 + q^2 + q^2`

            `= 0 + 2q^2 = 2q^2`

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