Posted by **Lucy** on Monday, February 27, 2012 at 11:17pm.

solve for t:

0=4sin(2t)cos(2t)-sin(2t)

- math/cal/trig solve for t -
**drwls**, Monday, February 27, 2012 at 11:38pm
0 = sin(2t)[4 cos(2t) -1]

There are two possible solutions:

sin(2t) = 0

(which leads to t = 0 or pi/2)

and

cos(2t) = 1/4

which leads to other values of t.

t = (1/2)cos^-1(1/4)

- math/cal/trig solve for t -
**Lucy**, Monday, February 27, 2012 at 11:44pm
if cos2t=1/4 then t= what??

- math/cal/trig solve for t -
**L.Bianchessi**, Tuesday, February 28, 2012 at 12:19am
Cos inverse of 1/4 =2t

So do cos inverse of 1/4=75.52...

So...

75.52...= 2t

Solve for t.

T=37.76..

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