Question 607038
csc(x) = 11/8


1/sin(x) = 11/8


sin(x) = 8/11


sin^2(x) = (8/11)^2


sin^2(x) = 64/121


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cos(2x)


1-2sin^2(x)


1 - 2*(64/121)


1 - 128/121


121/121 - 128/121


(121 - 128)/121


-7/121



So {{{cos(2theta)=-7/121}}}


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