Question
Mathematics Question on Trigonometry
If [23−(21)i23+(21)i]120=p+iq, then
A
p=cos20°, q=sin20°
B
p=-cos20°, q=-sin20°
C
p=cos20°, q=-sin20°
D
p=1, q=0
Answer
p=1, q=0
Explanation
Solution
The correct option is (D): p=1, q=0
If [23−(21)i23+(21)i]120=p+iq, then
p=cos20°, q=sin20°
p=-cos20°, q=-sin20°
p=cos20°, q=-sin20°
p=1, q=0
p=1, q=0
The correct option is (D): p=1, q=0