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sec^2x = 1/cos^2x

8cos^3x=0

cos(pi/2) = 0

so 8cos^3(pi/2)=0

I got lost on the first step.. Sorry, can you explain it more?

sure, first you need to memorize all of the identitites
memorize : sec(x) = 1/cos(x)

whoa whoa whoa,
\[8\cos^2(x) = 1\] not zero...

so sec^2(x) = 1/cos^2(x)

ah right 1 my bad

|dw:1329118155688:dw| So like this?

anyway multiply across so 1/cos^2(x) * cos^2(x) = cos^2(x) * 8cos(x)

1 = 8cos^3(x)

Ohh I see. Thank you.

So it would be x = pi/3 instead of pi/2 right?