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The value of 4 cos(pi/10)-3 sec(pi/10)- ...

The value of `4 cos(pi/10)-3 sec(pi/10)- 2 tan(pi/10)`is equal to

Answer

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Knowledge Check

  • The value of (cos(pi/10)+isin(pi/10))(cos((2pi)/10)+isin((2pi)/10))(cos((3pi)/10)+isin((3pi)/10))(cos((4pi)/10)+isin((4pi)/10)) is

    A
    a) `(-1)`
    B
    b) `1`
    C
    c) `2`
    D
    d) `(-2)`

  • The value of 2 tan "" ( pi )/(10)+ 3 sec "" ( pi )/( 10) - 4 cos "" ( pi )/( 10) is

    A
    0
    B
    `( 10)/( sqrt( 5))`
    C
    1
    D
    none

  • The principal value of cos^(-1) {1/sqrt2 ("cos"(9pi)/10 - "sin"(9pi)/10)} is :

    A
    `(3pi)/20`
    B
    `(7pi)/20`
    C
    `(7pi)/10`
    D
    None of these

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