73. The value of
cos( 480 ) cosec 390
is
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Answer:cos 480Step-by-step explanation:cos(360+120)=cos 120cos(120)=cos{180-60}-cos{60}= -1/2
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Answer:
Cos(360+120) Cosec(360+30)
Cos(120) Cosec(30)
Cos(180-60) 2/√3
-Cos60 x 2/√3
-1/2 x 2/√3
-2/2√3
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