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cosβ=a/c=3/5
b²=c²-a²
b²=5²-3²
b=4
cosα=b/c=4/5
2.
cosα=b/c
2/5=6/c
2c=30
c=15
c²-b²=a²
15²-6²=a²
225-36=a²
a²=189
a=3√21
cosβ=a/c=3√21/15=√21/5
3.
cosβ=a/c
1/2=10/c
c=20
c²-a²=b²
b²=400-100
b=10√3
cosα=b/c=10√3/20=√3/2
4.
c²-b²=a²
a²=100-36
a=8
cosα=b/c=6/10=3/5
cosβ=a/c=8/10=4/5
5.
cosα=b/c
3/4=b/4
4b=12
b=3
c²-b²=a²
a²=16-9
a=√7
cosβ=a/c=√7/4