Question

13. Find the value of sin (a+ B), cos (a + B), and tan (a + B), given

(i) sin a= 3/5 , cos 5/13
a and b in quadrant 1

(ii) cos a = -12/13 , cos b = 24/7

a in quadrant 2 and b in quadrant 3.​

Answer 1

Step-by-step explanation:

Sin(a+B) = sina cosB- cosa sinB

Cos(a+B)= cosacosB+sinasinB

tan(a+B)= tana-tanB/1-tana tanB