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Kelas 10 Matematika
Bab Trigonometri

θ = a

sin a = (√2)/5 → y/r

x = √(r² - y²)
x = √(5² - √2²)
x = √(25 - 2)
x = √23

1] cos a = x/r
cos a = (√23)/5

2] tan a = y/x
tan a = (√2)/(√23)
tan a = (√46)/23

3] sec a = r/x
sec a = (5√23)/23

4] cosec a = r/y
cosec a = (5√2)/2

5] cotan a = x/y
cotan a = (√46)/2