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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.