1.

If A + B + C = 180° thencos A cos C + cos(A + B) cos(B + C)------------------------------------------------cos A sin C-sin(A + B) cos(B+C)simplifies to​

Answer»

Step-by-step EXPLANATION:

A+B = 180-C

B+C = 180-A

so QUESTION SIMPLIFIES as:

(cosAcosC + cosCcosA)

___________________

(cosAsinC + sinCcosA)

which can be SIMPLIFIED to,

(2cosAcosC)/(2cosAsinC) = COTC



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