समतल 2x +y +3z −2 0 और x −2y +5 0 के बीच का कोण क्या है? What is the angle between the planes 2x +y +3z −2 0 and x −2y +5 0 ?

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समतल 2x +y +3z −2 0 और x −2y +5 0 के बीच का कोण क्या है? What is the angle between the planes 2x +y +3z −2 0 and x −2y +5 0 ?