csc(x) - 1/sin(x), sec(x) - 1/cos(x), cot (x) - 1/ tan(x), tan(x) - 1/cot(x), tan (x) - sin(x)/ cos(x), cot(x) - cos(x)/sin(x), cos(x)² - 1-sin(x)², sec(x)² - 1+tan(x)², tan²(x) - sec²(x)-1, sqr(a²-x²) - sqr(a²-(a*sin(x))²), sqr(a²+x²) - sqr(a²+(a*tan(x))²), sqr(x²-a²) - sqr((a*sec(x))²-a²),

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