Find the sign of the values of `tan113^0-cos107^0=a` and `tan107^0-cos105^0=b`

Explanation

To find the sign of the values of \( a = \tan 113^\circ - \cos 107^\circ \) and \( b = \tan 107^\circ - \cos 105^\circ \), we will analyze each expression step by step.

### Step 1: Rewrite the angles in terms of reference angles
We can express the angles in terms of their reference angles:
- \( 113^\circ = 180^\circ - 67^\circ \)
- \( 107^\circ = 180^\circ - 73^\circ \)
- \( 105^\circ = 180^\circ - 75^\circ \)

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