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त्रिकोणमिति का परिचय

Question

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निम्नलिखित का मान निकालिए:
$fraction numerator sin space 18 degree over denominator cos space 72 degree end fraction$

Solution

fraction numerator sin space 18 degree over denominator cos space 72 degree end fraction space equals space fraction numerator sin space left parenthesis 90 degree minus 72 degree right parenthesis over denominator cos space 72 degree end fraction space equals space fraction numerator cos space 72 degree over denominator cos space 72 degree end fraction space space space space space space space space space space space space space space space space space space equals space 1. space space space space space space space space space space space space space space space space space space space space space space space space space left square bracket because space space sin space left parenthesis 90 degree minus straight theta right parenthesis space equals space cos space straight theta right square bracket

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