HELP ASAP I WILL GIVE 30 points to whoever can show their work!

asked Mar 15, 2023 96.5k views

5 votes

4.8k points

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5 votes

Answer:

Explanation:

sin(A)=2/5

$cos^2(A) +sin^2(A)=1\\cos^2(A)+[(2)/(5)]^2=1\\cos^2(A)+(4)/(25)=1\\ cos^2(A)=1-(4)/(25)\\ cos^2(A)=(21)/(25)\\ cosA=(√(21) )/(5)$

Sneftel answered Mar 20, 2023

3.5k points

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