Question

10. (tan40° + tan20°) / (tan45° - tan40° tan20°)
1) 1
2)
13
3) 3
4) - V3​

Answer 1

Step-by-step explanation:

we know that

$\tan( \alpha + \beta ) = \frac{tan \alpha + tan \beta }{1 - tan \alpha tan \beta }$

$\tan(60) = tan(40 + 20)$

APPLYING IN THE FIRST FORMULA

WE GET ANSWER AS

tan(60)= √3

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