point
If (x + iy); = 2 + 3i , then 3x+2y is equal to :
1 (A) - 20
O (B) - 60
O (C) - 120
O (D) 60
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Answer:
+ z = reiθ +re Sol: -iθ z + z = reiθ +re iθ
z z re-iθ reiθ
= ei(2θ) +e-i(2θ) = e ( ) +e ( )
= cos2θ+isin2θ
+cos2θ -isin2θ
= 2cos2θ
Step-by-step explanation:
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