`d)`

`D=12/[1+tan^2 73^@]-4tan75^@*cot105^@+12sin^2 107^@`

`D=12/[1/[cos^2 73^@]]+4tan75^@*cot75^@+12sin^2 73^@`

`D=12cos^2 73^@+4+12sin^2 73^@`

`D=12(sin^2 73^@+cos^2 73^@)+4`

`D=12+4`

`D=16`

`e)`

`E=4tan32^@*cos60^@*cot148^@+[5cot^2 108^@]/[1+tan^2 18^@]+5sin^2 72^@`

`E=4tan32^@*cos 60^@*(-cot32)^@+[5cot^2 72^@]/[1/[cos^2 18^@]]+5sin^2 72^@`

`E=-4cos60^@+[5cos^2 72^@]/[sin^2 72^@] * (sin^2 72^@)+5sin^2 72^@`

`E=-4*1/2+5cos^2 72^@+5sin^2 72^@`

`E=-2+5(cos^2 72^@+sin^2 72^@)`

`E=-2+5`

`E=3`