⇢ АВ
Анастасия Васильева
НБ
Нина Безрученко
ctg = 8/15
tg = 15/8
sek = 1/ cos, sec = K( 1+tgˇ2) = K(1+ (15/8)ˇ2) = 17/8, ==> cos = 8/17
sin= K (1-cosˇ2) = K(1-(8/17)ˇ2) = K( 1- 64/289) =15/17
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ctg = 8/15
tg = 15/8
sek = 1/ cos, sec = K( 1+tgˇ2) = K(1+ (15/8)ˇ2) = 17/8, ==> cos = 8/17
sin= K (1-cosˇ2) = K(1-(8/17)ˇ2) = K( 1- 64/289) =15/17