If (a_1, b_1,c_1), (a_2,b_2,c_2) are the direction cosines of two lines making an angle \theta with each other, then \cos \theta=

Correct Answer is : |a1a2+b1b2+c1c2|

(a_1a_2+b_1b_2+c_1c_2)/(\sqrt{a^2_1a^2_2+b^2_1b^2_2+c^2_1c^2_2})

AP EAMCET Engineering 23 Sep 2020 Shift 1 Paper

Section: Mathematics

Question : 72 of 160

Marks: +1, -0

If (a1,b1,c1), (a2,b2,c2) are the direction cosines of two lines making an angle θ with each other, then cos‌θ=

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