Which relationship in the triangle must be true? 8 b B 3 O sin(B) = sin(A) O sin(B) = cos(90 – B) O cos(B) = sin(180 – B) Orcos(B) = cos(A)​

we know that

In the right triangle ABC

m∠A+m∠B=90 degrees> by complementary angles

m∠A= 90 degrees -m∠B > equation 1

so

sin (B)=b/c

cos (A)= b/c

sin (B)= cos (A)>equation 2

substitute equation 1 in equation 2

sin (B) = cos (90- B)

herefore

the answer is the option

sin(B) = cos(90 – B)

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

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