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corrections 7 cos 2t=3

what does arccos mean

am I setting calculator in rad. or degrees

oh - then find angle whose cos is 3/7 0 calculator will give you value of 2t in first quadrant

cos 3/7= .91 now what

how do I get the other value

you need cos-1 not cos
check again : i make it 1.128 rad

ok that is 1.099??

1/cos(3/7) right?

and how do you know I need cos-1 and not cos?

do I just press cos then -1

cos-1 does not mean 1 / cos in this context

cos-1 notation is a bit confusing - in Europe they use arccos which makes more sense

cos (3/7)=.91. Do I press shift key before entering cos (3/7)? don't know the shift key

I haven't done any problems with cos-1

calculators vary
you either press shift cos (3/7)
or (3/7) shift cos

the correct value is 1.127 (to 3 dec places)

sorry 1.128

its a bit hard to explain without seeing your calculator....