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Home / Doubts and Solutions/JUNIOR/Class 12 Science/Mathematics

<br /> <b>Warning</b>: Unknown: Unable to allocate memory for pool. in <b>Unknown</b> on line <b>0</b><br /> <br /> <b>Warning</b>: include() [<a href='function.include'>function.include</a>]: Unable to allocate memory for pool. in <b>/home/greycel/www/topperbeta.topperlearning.com/app/webroot/js/tiny_mce/plugins/tiny_mce_wiris/integration/service.php</b> on line <b>22</b><br /> f i n d space p r i n c i p a l space v a l u e s space o f space cos to the power of minus left parenthesis cos left parenthesis 7 straight pi divided by 6 right parenthesis right parenthesis

Asked by yash.bisht9910 23rd September 2015, 6:21 PM
Answered by Expert
Answer:

Hi Yash,

cos to the power of negative 1 end exponent open parentheses cos open parentheses fraction numerator 7 straight pi over denominator 6 end fraction close parentheses close parentheses equals c o s to the power of negative 1 end exponent open parentheses c o s open parentheses straight pi plus straight pi over 6 close parentheses close parentheses equals c o s to the power of negative 1 end exponent open parentheses c o s open parentheses straight pi plus straight pi over 6 close parentheses close parentheses space equals c o s to the power of negative 1 end exponent open parentheses negative c o s open parentheses straight pi over 6 close parentheses close parentheses equals c o s to the power of negative 1 end exponent open parentheses negative fraction numerator square root of 3 over denominator 2 end fraction close parentheses l e t space c o s to the power of negative 1 end exponent open parentheses negative fraction numerator square root of 3 over denominator 2 end fraction close parentheses space equals x cos x equals negative fraction numerator square root of 3 over denominator 2 end fraction space w h e r e space 0 degree space less than space x less than space 180 degree x space equals space 120 degree.

Answered by Expert 23rd September 2015, 6:41 PM
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