Question

in triangle abc angle C is equal to 90 then cos a + b is equal to​

Answer 1

Answer:

0

Step-by-step explanation:

we have

angle C=90°

also A+B+C=180°

but C=90°

90°+A+B=180

A+B=180°-90°

A+B=90°

therefore

cos(A+B)

cos90°=0