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tan69 + tan66 + 1= tan69.tan66

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tan69 + tan66 + 1= tan69.tan66

Posted by Abhishek Rai 5 years, 6 months ago

CBSE > Class 11 > Mathematics

2 answers

Luna Crystal 5 years, 6 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.

1Thank You

Saurav Kumar 5 years, 6 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

0Thank You

ANSWER

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CBSE > Class 11 > Mathematics