if cos a=4/5 find sin A
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0
sin^2a=1-(4/5)^2
=1-16/25
=9/25
3/5
=1-16/25
=9/25
3/5
Akshitha0912:
1 - 16/25 = 9/25. It's not 9/16. Correct it
Answered by
1
cos a = 4/5
cos a = adjacent side / hypotenuse
adjacent side = 4
hypotenuse = 5
then, opposite side = 3
sin a = 3/5
cos a = adjacent side / hypotenuse
adjacent side = 4
hypotenuse = 5
then, opposite side = 3
sin a = 3/5
3/4 is the right answer or 3/5 is the right answer
3/5.
because....
both of us did correct, but he was mistaken by writing 1-(16/25) = 9/16. But, it is 9/25
got it ??
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