Question

if sin theta equals to 12 13 cos B equals toSania = 212 13 cos B equals to 3 by 5 and other neither a nor b is in first quadrant then find the quardrant in which A+Blies​

Answer 1

Answer:

Step-by-step explanation:

Dear student

 

sin a = 12/13

 

Hence a will be in 2nd quadrant.

 

cos b = 3/5  

Hence b will lie in 4th quadrant

 

Now

 

sin (a+b) = sin a cos b + cos a sin b

 

= (12/13) * (3/5) + (-5/13) *( -4/5)

 

= 56/65

 

cos (a +b) = -15/65 + 48/65 = 33/65

 

Hence (a+b ) will lie in 1st quadrant