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If a1costheta+b1sintheta+c1=0 and a2cost...

If `a_1costheta+b_1sintheta+c_1=0 and a_2costheta+b_2sintheta+c_2=0` then `(b_1c_2-b_2c_1)^2+(c_1a_2-c_2a_1)^2=`

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