Now, as θ becomes very close to 0 (θ [img src="http://www.themathpage.com/aCalc/calc_IMG/Rarrow.gif" width="24" height="15" alt="Right arrow">0), cos becomes very close to 1; therefore, 1 − cos θ becomes very close to 0. The expression in the middle, being less than 1 − cos θ, becomes even closer to 0 (and on the left is bounded by 0), therefore the expression in the middle will definitely approach 0. This means: