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Rectify the error if any in the followin...

Rectify the error if any in the following
`"sin"^(-1)4/(5)+"sin"^(-1)12/(13)+"sin"^(-1)33/(65)`
`="sin"^(-1)[4/(5)sqrt(1-44/(169))+12/(13)sqrt(1-16/(25))]+"sin"^(-1)33/(65)`
`="sin"^(-1)(56/(65))+"cos"^(-1)sqrt(1-(33/(65))^(2))`
`="sin"^(-1)(56/(65))+"cos"^(-1)(56/(65))=pi/(2)`

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ARIHANT PUBLICATION-INVERSE TRIGONOMETRIC FUNCTIONS -ODISHA BUREAU.S TEXTBOOK SOLUTIONS
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