In triangle ABC, where and the hypotenuse is 5, . What is ?

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In triangle ABC, where <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03143.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mi>C</m:mi><m:mo>=</m:mo><m:mn>90</m:mn><m:mi>°</m:mi></m:mrow></m:math>--> and the hypotenuse is 5, <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03144.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mo>sin</m:mo><m:mi>A</m:mi><m:mo>=</m:mo><m:mfrac><m:mn>3</m:mn><m:mn>5</m:mn></m:mfrac></m:mrow></m:math>-->. What is <img alt='images' src='https://www.fatskills.com/images2/SAT/eq03145.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mo>cos</m:mo><m:mi>B</m:mi></m:mrow></m:math>-->?