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tan 100. + tan 125.+ (tan 100. )(tan 125.) is equal to
A. 0 B. 1/2 C. -1 D. 1
EXPLAIN HOW?
tan225=tan(125+100),
tan(180+45)= (tan125+tan100)/(1-tan125tan100),
tan45=(tan125+tan100)/(1-tan125tan100),
1=(tan125+tan100)/(1-tan125tan100),
tan125+tan100=1-tan125tan100,
tan125+tan100+tan125tan100=1.
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