In desktop versions:
Line 42 exemption amount is $4,050 multiplied by line 6d on the 1040 if line 38 is $156,900 or less. If it is adjusted, you can see the worksheet by selecting the quickzoom to worksheet link on the line 42 on the 1040, in Forms mode (upper right corner of your screen).
Line 79 amount is computed on Form 2210. You can see that computation on the Form 2210 in Forms mode. Scroll list of forms on the left and select to load the form on the right.
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