If the acute angle between the line →r=^i+2^j+λ(4^i−3^k) and xy� – InterviewSolution

1.	If the acute angle between the line →r=^i+2^j+λ(4^i−3^k) and xy−plane is α and the acute angle between the planes x+2y=0 and 2x+y=0 is β, then (cos2α+sin2β) equals
Answer» If the acute angle between the line $\to r =^i + 2^j + λ (4^i - 3^k)$ and $x y -$ plane is $α$ and the acute angle between the planes $x + 2 y = 0$ and $2 x + y = 0$ is $β,$ then $({cos}^{2} α + {sin}^{2} β)$ equals

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