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Solve the equation cos x = sin 20 where x is acute. 
20060326 

Elle pose la question : Solve the equation cos x = sin 20 where x is acute. Stephen La Rocque lui répond. 





Complementary and Supplementary Angles 
19981021 

Christina Saunders pose la question : I am in 9th grade and my math teacher wanted us to find out why complimentary angles are called complimentary and why supplimentary angles are called supplimentary. I have looked everywhere and asked numerous people, but I have yet to find an answer. My math teacher said it had something to do with trigonometry. Do you have an answer for me? Chris Fisher and Penny Nom lui répond. 


