If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin (a+b)

Solution

it is given that ,a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5

Used the Identity

sin²a+cos²a=1

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

first one is a: renaming a fraction. second one is c: de-c

step-by-step explanation:

my explanation is that these were the answers on edg : )

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step-by-step explanation: