C:d
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The simplest way: Ratio a : b equals ratio c : d if (and only if) a*d = b*c
The ratio of (a/b) and (c/d) is (a/b)/(c/d) = (a/b)*(d/c) = ad/bc So, the method is to multiply the first fraction by the reciprocal of the second.
cosecant of C + cosecant of D = -2 sine of (C+D)/2 X sine of (C - D)/2
C = pi x D is the ratio of a circle's circumference to its diameter.
Pi is the ratio of circumference to diameter. C/d=pi always!!!