trig solve for t

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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