show that
(sin 35 / cos 55) square - 2 cos²60 =1/2
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(sin35/cos55)^2-2cos^260=1/2
Step-by-step explanation:
(sin35/cos(90-35))^2-2cos^2 60=1/2
(sin35/cos35)^2-2(1/2)^2=1/2
1-2(1/4)=1/2
1-1(1/2)=1/2
1-1/2=1/2
2-1/2=1/2
1/2=1/2
rhs=lhs
hence proved
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