A
a Do not forget that we are not allowed to !
B
b Do not forget that we are not allowed to divide by zero!
C
c Do not forget that we are not allowed to divide by zero!
D
d Do not forget that we are not allowed to divide by zero!
A
a 90+n*180^(∘), see solution.
B
b n* 180^(∘), see solution.
C
c 90+n*180^(∘), see solution.
D
d n* 180^(∘), see solution.
Practice makes perfect