Doubt from area

20200205_113840

oops sorry its 10th problem i mistakly typed 9th
9th is simple


check if the answer is correct and the method is shorter @Sneha_2021

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good one @prajwal_2020 thanks for ur approches my solution was going too calculative..

  • do u have some more shortcuts trick for area under curve??

this is the only shortcut i know which is used for areas