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TransendentialPI
 3 years ago
Folks,
I'm trying to evaluate (1/2)sin(2arcsec(8)) where arcsec is the inverse secant. The answer is supposed to be 3sqrt(7)/128. I'll post a sketch of what I've done so far.
TransendentialPI
 3 years ago
Folks, I'm trying to evaluate (1/2)sin(2arcsec(8)) where arcsec is the inverse secant. The answer is supposed to be 3sqrt(7)/128. I'll post a sketch of what I've done so far.

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TransendentialPI
 3 years ago
Best ResponseYou've already chosen the best response.0dw:1343155955658:dw. I'm not sure how deal with the 2arcsec(8)

Uniquebum
 3 years ago
Best ResponseYou've already chosen the best response.0\[arcsec(8) = \frac{\pi}{2}+\arcsin(1/8)\] If that sounds weird, draw a sketch and you might notice why.

TransendentialPI
 3 years ago
Best ResponseYou've already chosen the best response.0It might be an equivalence, but how does that become 3sqrt(7)/128?

TransendentialPI
 3 years ago
Best ResponseYou've already chosen the best response.0Is there an identity I'm missing?
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