First slide

Multiple and sub- multiple Angles

Question

If $A = 35^{0}, B = 15^{0} and C = 40^{0}$ then $\tan A \tan B + \tan B \tan C + \tan C \tan A =$

Easy

A

0
B

3
C

1
D

-1

Solution

$\begin{array}{l} I f A + B + C = 90^{\circ}, t h e n \\ \tan A \tan B + \tan B \tan C + \tan C \tan A = 1 \end{array}$

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