find
cosec^2– tan^2 25 +1/
sin^2 17 + sin²73
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Cosec ²65-Tan²25/Sin²17+Sin²73+1/√3 *(tan10.tan30.tan80).
=sec²25-tan²25/sin²17+cos²17+1/√3 *(tan10.tan30.cot10).
=1+1/√3*tan30.
=1+1/3
=4/3
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