SSC CHSL 11 Jan 2017 Shift 2 Paper

Question : 90 of 100

Marks: +1, -0

What is the value of sec -2π/3 ?

Solution:

Expression : sec -2π/3
∵

sec(−x) = sec(x)

⇒

sec( {-2x}/3 ) = sec({2x}/3 )

sec(π − π/ 3 ) = −sec( π/3)

-2

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