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cos A = b/c
c² = a²+b²
Sin²A + Cos²A = (a/c)² + (b/c)²
= a²/c² + b²/c²
= a²+b² / c²
= c² / c²
= 1
b. tan B = b/a --> Sin B = b/c
b = c sin B
Cos B = a/c
a = c cos B
sehingga
tan B = c Sin B / c Cos B
= Sin B / Cos B
c. Cosec A = 1/ sin A
= c/a
Cotan A = 1 / tan A
= b/a
Cosec²A - cotan²A = (c/a)² - (b/a)²
= c²/a² - b²/a²
= c²-b² / a²
= a² / a²
= 1