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10-05-2017
Mathematics

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trig help ..............

trig help class=

Respuesta :

11-05-2017

sinA = 3/5
cosA = 4/5

cosB = 3/5
sinB = 4/5

sin(A+B) = sinAcosB + cosAsinB

= (3/5)(3/5) + (4/5)(4/5)
= 9/25 + 16/25
=(9+16)/25
=25/25
=1

therefore, the answer is B

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