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z3^2/(z1.z2)= (A) sec^2.cos2theta (B) co...

`z_3^2/(z_1.z_2)=` (A) `sec^2.cos2theta` (B) `costheta.sec^22theta` (C) `cos^2theta.sec2theta` (D) `sectheta.sec^22theta`

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