1.

Sin10 cos 20 tan40 tan 50 cosec70 sec80

Answer»
sin(90-80) cos(90-70) tan(90-50)tan50cosec70sec80
 
cos80 sin70 cot 50 tan50 cosec70 sec80
sin70 cosec70 cos 80 sec80 cot 50 tan50
1/cosec70 cosec70 1/sec80 sec80
1/tan50 tan50
=1



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