Question

please help
please tell this one
class 11 maths chapter 3 Trigonometry​

Answer 1

Answer:

Step-by-step explanation:

tan(A+B)=(tanA+tanB)/(1-tanAtanB)

so A=69, B=66

tan(A+B)=tan(69+66)=tan(135)

tan(135)= tan(180-45)=-tan45

tan(69+66)=-1   {tan(180-A)=-tanA) }

(tan69+tan66)/(1-tan69tan66)=-1