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tan69 + tan66 + 1= tan69.tan66

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tan69 + tan66 + 1= tan69.tan66
  • 2 answers

Luna Crystal 7 years, 2 months ago

=>We know that, tan(135)=tan(180-45)= -tan45= -1 =>So, tan(135)=-1 =>tan(66+69)= -1 => (tan66+tan69)/(1-tan66.tan69)=-1 => tan66+tan69= -1+tan66.tan69 =>tan66+tan69+1=tan69.tan66...Hence, proved.

Saurav Kumar 7 years, 2 months ago

We know that tan(69+66)=tan69 + tan 66/1-tan69.tan66 Taking rhs, Tan69 + tan66=1 -tan69.tan66 1-tan69-tan66=tan69.tan66 Vo kabhi proof nhi hoga
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