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x+y=90^@ then x and y are calledangles....

`x+y=90^@` then x and y are called______angles.

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Check and discuss the above relations [sin (90^@ - x) = (AB) /(AC) = cos x cos (90^@ - x) = (BC)/(AC) = sin x tan (90^@ - x) = (AB)/(BC) = cot x cot(90^@ - x) = (BC)/(AB) = tan x , cosec(90^@ - x) = (AC)/(AB) = sec x , sec(90^@ - x) = (AC)/(BC) = cosec x] , in the case of angle between 0^@ and 90^@ , whether they hold for these angles or not ?So, sin(90^@ - A) = cosA