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

Explanation

`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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