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teachoo.com
Misc 1- Find angle between lines whose direction ratios are
Misc 1 Find the angle between the lines whose direction ratios are a, b, c and b − c, c − a, a − b. Angle between the lines with direction ratios a1, b1, c1 and a2, b2, c2 is given by cos θ = |(𝒂_𝟏 𝒂_𝟐 𝒃_𝟏 𝒃_𝟐 𝒄_𝟏 𝒄_𝟐)/(√(𝒂_𝟏^𝟐 𝒃_𝟏^𝟐 𝒄_𝟏^𝟐 ) √(𝒂_𝟏^𝟐 𝒃_𝟏 ...
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