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Re: Need formulas for arcsin and arctan
From: Bill B
Date: 2006 Mar 29, 22:59 -0500
From: Bill B
Date: 2006 Mar 29, 22:59 -0500
Lu wrote: > On the other hand, regardless of whether an angle is expressed as 45 > degrees or Pi/4 radians, its sine and cosine are the same. So scanning > down a table that expresses angles in degrees for a sine or cosine that > matches your calculation should give you arcsine(x) in degrees. > Whoops, in first paragraph should have said "You get radians by > MULTIPLYING the angle in degrees by 2*Pi/360. I am sorry, I did not express myself clearly. I understand the conversion from degrees to rads to grads, and why engineers etc. find radians more convenient. What I am trying understand: Is "arcsine" the *exact* equivalent of "sine ^-1" outside the kingdom of the pocket calculator today? Specifically, it seems "arcsine" was the angle in radians. If so, has that changed? For example, several decades ago--unless you could walk or stand on water--you could not walk or stand on a "dock." (Hence the term "dry dock"). Gourmet was a noun, not an adjective. Was arcsine exclusively refering to angle in radians, and is that the case or not today? Thanks again Bill
