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Homework Statement
If cos x = a/b and tan x = c/d; where a, b, c do not equal 0, then sin x is...
(a) bd/ac
(b) bc/ad
(c) ad/bc
(d) ad/bc
Homework Equations
The Attempt at a Solution
The way I see it, if cos x = a/b, then b=hypotenuse.
if tan x = c/d, then d= hypotenuse (two hypotenuse values?) and c = opposite.
Therefore sin x = c/d. I don't know why the answers in the book use products of the vairables in their numerators and denominators.
Please help.
Much thanks in advance.