the value of tan 18 tan 23 tan 42 tan 67 is
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Step-by-step explanation:
tan(23+67)=tan23°+tan67°
1-tan23°tan67°
tan(90)=tan23°+tan67°
1-tan23°tan67°
1 =tan23°+tan67°
0 1-tan23°tan67°
=> 1-tan23°tan67°=0
tan23 tan67=1
tan(18+42)=(tan18+tan42)/1-tan18tan42
tan60°=(tan18+tan42)/1-tan18tan42
√3=(tan18+tan42)/1-tan18tan42
1-tan18 tan42=(tan18+tan42)/√3
tan18 tan42=1-(tan18+tan42)/√3
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