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If alpha,beta,gamma are the direction an...

If `alpha,beta,gamma` are the direction angles of a vector,
then which the following can be `alpha+beta`?
80°
60°
120°
can’t be determined

A

80°

B

60°

C

120°

D

can’t be determined

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Knowledge Check

  • If alpha and beta are the roots of the equation x^(2)-ax+b= 0 and A_(n)=alpha^(n) +beta^(n) ,then which of the following is true?

    A
    `A_(n+1)=a A_(n)+bA_(n-1)`
    B
    `A_(n+1)=bA_(n)+aA_(n-1)`
    C
    `A_(n+1)=aA_(n)-bA_(n-1)`
    D
    `A_(n+1)=bA_(n)-aA_(n-1)`

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