tan69°+tan66°+1
/1-tan69°.tan66°=0
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tan(A+B) =tanA+tanB/1-tanAtanB
So,
tan(69°+66°)=tan135°
tan(180-45°)
-tan45°
-1
So,
tan(69°+66°)=tan135°
tan(180-45°)
-tan45°
-1
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