Question

if sin(A+B) = 1 then cos(A+B)​

Answer 1

Answer:

sin(a+b)=1

we can replace 1 by sin 90

=> sin(a+b)=sin(90)

=> a+b= 90

hence,cos(a+b)=0

now expanding

=> cosacosb-sinasinb=0

=> cosacosb=sinasinb

=> tana=tanb

hence angle a=b

=> a-b=0

therefore, cos(a-b)=1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

values of A and B is 60 and 30 , so cos(A+B)=0°

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