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Mathematics 7 Online
OpenStudy (anonymous):

How would you find arctan(1) without a calculator?

OpenStudy (mathstudent55):

tanA = sinA/cosA For what value of A is sinA = cosA

OpenStudy (anonymous):

45... @mathstudent55

OpenStudy (mathstudent55):

exactly

OpenStudy (anonymous):

but what if i have to find arctan(-1/sqrt3)....this is tougher. @mathstudent55

OpenStudy (anonymous):

@tomiko so you want \(\cos x=-\sqrt3\sin x\)

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