If $x$·sin45°·cos45° = tan45°·cosec30°, then $x$ equals:

sin45°·cos45° = (1/√2)(1/√2) = 1/2, while tan45° = 1 and cosec30° = 1/sin30° = 2. The equation is therefore $x/2=2$, so $x=4$. Treating sin45°·cos45° as 1 gives $x=2$, reading cosec30° as 1/2 (that is sin30°) gives $x=1$, and inverting the last step gives 1/4.