1.

The value of cot15. Cot75 .cot60. Cot30 +tan45 is equal to

Answer»

cot(90° – 75) cot(90° – 60°) cot 45° cot 60° cot 75°  

= tan 75° tan 60° (1) cot 60° cot 75° 

= 1



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