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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?

3 years ago

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Answers : (1)

                                        

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.

3 years ago

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