TS EAMCET 9-Sep-2020 Shift 1 Solved Paper

Section: Mathematics

Question : 60 of 160

Marks: +1, -0

If l, m, n are the direction cosines of a line which makes angles α, β and γ with the coordinate axes X, Y, Z respectively, then lm+mn+nl takes the maximum value when

α, β, γ are in Arithmetic progression
α= β= γ
any two of α, β, γ are the same
one of α, β, γ is zero and the remaining two are non-zero and unequal.

Validate

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