Trigonometric functions

In the right triangle is:

 tg α=21

Find the value of s and c:

 sin α=s5

 cos α=c5

Correct answer:

s =  2
c =  1

Step-by-step explanation:

 tg α=21=ab  sin α=ac=aa2+b2=25
 cos α=bc=ba2+b2=15

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