Question

If A + B + C = π, then what is the value of cos(A+B) + cos C?
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Answer 1

Answer:

0

Step-by-step explanation:

A + B + C = π

so A + B = π - C

now , cos( A + B) + cosC

= cos(π -C) + cos C

= -cosC + cosC

= 0

Answer 2

Answer:

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