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Find the sign of the values of tan113^0-...

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

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`a=tan113-cos117`
`a=tan(180-67)-cos(180-73)`
`a=-tan67+cos73`
`a=cos73-tan67 `a<0`
`b=tan117-cos105`
`b=tan(180-73)-cos(180-75)`
`b=cos75-tan73ltcos75-tan45<0`
...
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