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( sin 35 / cos 55 )^2 +(cos 55 / sin 35 ) - 2cos 60?
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( sin 35 / cos 55 )^2 +(cos 55 / sin 35 ) - 2cos 60?
(sin 35/ cos 55)^2+(cos 55 /sin35)-2cos60=1^2+1-2*1/2=1+1-1=1so the ans is 1.
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( sin 35 / cos 55 )^2 +(cos 55 / sin 35 ) - 2cos 60?
Sin35/cos (90-35)^2+(cos55/sin (90-55) )-2cos60cos (90-35)=sin35sin (90-55)=cos55and cos60=1/2 cos(sin35/sin35)^2+ cos55/cos55-2×1/2=1+1-1=2-1=1
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