tolong bantuin jawab pake caranya..

sin α = 7/25. sin β = 3/5
x = √25²-7² x = √5²-3²
= √625-49. = √25-9
= √576. = √16
= 24. = 4
cos α = 24/25. cos β = 4/5

cos (α+β) = cos α cos β - sin α sin β
= 24/25. 4/5 - 7/25. 3/5
= 96/125 - 21/125
= 75/125
= 3/5

cos (α-β) = cos α cos β -+sin α sin β
= 24/25. 4/5 + 7/25. 3/5
= 96/125 + 21/125
= 117/125