Assertion (A) : z1=1+i,z2=1−i then the polar form of z1z2 is (1,π2) Reason (R) : z1=(r1,θ1),z2=(r2,θ2) then z1z2 is represented as a point in the polar form (r1r2,θ1−θ2)
A
Both A and R are true and R is the correct explanation of A
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B
Both A and R are true but R is not the correct explanation of A
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C
A is false, R is true
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D
A is true R is false
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Solution
The correct option is D Both A and R are true and R is the correct explanation of A z1=1+i =√2eiπ/4 z2=1−i √2e−iπ/4 ∴z1z2=√2eiπ/4√2e−iπ/4 =ei(π/4+π/4) =eiπ/2 =1(cosπ/2+isinπ/2) =(1,π2)