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= (c/b)² + ( a/b)²
= (c² +a²)/b²
= b² / b² =1 ⇒a² +c² = b²
b. cosec² a + cotan² a = ( b/a)² - (c/a)²
= (b²-c²) /a²
= a² / a² =1 ⇒b²-c²= a²