3 years ago

Help me please.No spammmers.

Mathematics

1 answer:

egoroff_w [7]3 years ago

5 0

Answer:

Step-by-step explanation:

cot =cos/sin =a/b

cos=a/b*sin

(sin-cos)/(sin+cos) =(sin-sin*a/b)(sin+sin*a/b)

=(1-a/b)/(a+a/b)

=(b-a)/(a+b)

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