Step-by-step explanation:
as tan38=cot(90-38)=cot42=1/tan42
tan23 =cot(90-23)=cot67=1/tan68
now 1/tan42 *1/tan67 *tan42*tan67 =1
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Verified answer
Step-by-step explanation:
as tan38=cot(90-38)=cot42=1/tan42
tan23 =cot(90-23)=cot67=1/tan68
now 1/tan42 *1/tan67 *tan42*tan67 =1