Question

tan69°+tan66°+1=tan69°tan66°
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Answer 1

Answer:

Hi ,

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( tanA + tanB )/( 1 - tanAtanB

= tan(A+B )

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( tan69+tan66)/(1-tan69tan66)

= tan( 69 + 66 )

= tan 135

= tan ( 90 + 45 )

= - cot 45

= -1

I hope this helps you.

Step-by-step explanation:

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