# Show that (1+tan20) ( 1+tan25) = 2 .[use tan(A+B) = tan A+tan B 1-tanA+tanB ]

1
by lilly4189
yo pilla chushnava im ri8 samma told me abba bolriun na
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any ways okay! cool!

2014-10-16T23:43:51+05:30

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1+ tan25 + tan20 + tan20tan25 +1 - 1
2 + tan(25 + 20)(1 - tan20tan25) - (1 -  tan20tan25)  { using the formula you gave ie use                                                                                                      tan(A+B) = tanA+tanB/ 1- tanAtanB}
2 + (1 -  tan20tan25)(tan45 - 1)
2 + (1 -  tan20tan25)(1 - 1)
2 + 0
= 2 PROVED
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