`A=sin23^@-cos67^@`

`=sin23^@-sin23^@`

`=0`

`B=tan18^@-cot72^@`

`=tan18^@-tan18^@`

`=0`

`C=(sin60^@.cos30^@)/(2cot45^@)`

`=(sin60^@.sin60^@)/(2cot45^@)`

`=(sin^2 60^@)/(2cot45^@)`

`=3/4:2`

`=3/8`

`D=cot44^@.cot45^@.cot46^@`

`=tan46^@.cot45^@.cot45^@`

`=cot45^@`

`=tan45^@`

`=1`

`E=sin10^@+sin40^@-cos50^@-cos80^@`

`=(sin10^@-cos80^@)+(sin40^@-cos50^@)`

`=(sin10^@-sin10^@)+(sin40^@-sin40^@)`

`=0`

`F=12.tan32^@.tan58^@-(8cot35^@)/tan55^@`

`=12.tan32^@.cot32^@-(8cot35^@)/cot35^@`

`=12.1-8`

`=12-8`

`=4`