dcowboys107 Posted October 21, 2009 Share Posted October 21, 2009 Rewrite f(x) = 4csc^2(x) + 9tan^2(x) in terms of cos(x). NOTE: Expressions such as cos^2(x) must be entered as cos(x)^2 or (cos(x))2. I rewrote csc(x)^2 as 1/1-cos(x)^2 and tan^2 as ((1-cos(x)/cos(x))^2 I'm having a hard time simplifying that down to just cos(x). Link to comment Share on other sites More sharing options...
Mage Posted October 28, 2009 Share Posted October 28, 2009 Hello dcowboys107 I rewrote csc(x)^2 as 1/1-cos(x)^2 and tan^2 as ((1-cos(x)/cos(x))^2 About your tan identity... are you sure? Please post your derivation Link to comment Share on other sites More sharing options...
9e0r9e Posted February 17, 2010 Share Posted February 17, 2010 sin^2(x) + cos^2(x) = 1 dividing through by cos^2(x) gives, tan^2(x) + 1 = csc^2(x) and substitute in Link to comment Share on other sites More sharing options...
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