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tan a = 8/15
maka nilai y=15,r=17
lalu dicari nilai x nya,x=akar 17^2-15^2
=akar 289-225
=akar 64
=8
maka sin a=y/r=8/17
tan a=y/x=15/8
maka sin a+tan a=8/17+15/8=319/136