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