Express cos75 0 + cot 75 0 in term of angles between 0 0 and 30 0
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cos 75 = cos( 90 - 15) = sin 15
cot 75 = cot(90 - 15) = tan 15
cos 75 degree + cot 75 degree = sin 15 degree + tan 15 degree
cot 75 = cot(90 - 15) = tan 15
cos 75 degree + cot 75 degree = sin 15 degree + tan 15 degree
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