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Verified Answer :

syed514

60=pi/3

cos 60 = 0.5
sec 240 = 1/ cos 240
 cos 240 = cos (180+60)

cos (180+x) = -cos x
cos (180+x) = -cos x

so

cos 240 = -cos 60
              = -0.5
sec 240 =1/ cos 240
              = 1/(-0.5)
              = -2

scme1702

sec∅ = 1/cos∅
= 1/cos(240)
= 1/cos(180 + 60)
= 1/-cos(60)
= 1/(-1/2)
= -2

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