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a
34
b
32
c
23
d
43
answer is C.
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Detailed Solution
sin(-660)=-sin660=-sin(7×90+30)=cos30=32 tan1050=tan(11×90+60)=-cot60=13sec(-420)=sec420=sec(4×90+60)=sec60=2 cos225=cos(180+45)=-cos45=-12cosec(360-45)=-cosec45=-2cos510=cos(5×90+60)=-sin60=-32subtute given equation