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3 years ago

8

If sina4/5 find cosa

1 answer:

DerKrebs [107]3 years ago

4 0

Answer:

cosa = 3/5

Step-by-step explanation:

Use Trignometrical identity cosa = √ 1 − sin ^2a

cos a = √ 1 − 16 /25 = √ 9 /25 = 3 /5

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