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cos(60) = 0.5 The simplest way is to use a calculator.
y = arcsin( cos 48 ); arcsin may be seen as sin-1 on your calculator.
tan cot sec cosec sin cos cot
They are used to approximate functions like sin(x) and cos(x), so a calculator, for example, can calculate sin (x) and cos(x), which are infinite series functions.
sin stands for sine cos stands for cosine and tan stands for tangent