Hi there .. I'm not sure how to approach this question and I would greatly appreciate it if someone could help me Thanks a bunch . Here's the question : Prove the identity . sin^4x - cos^4x = sin^2x - cos^2x
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Originally Posted by asiankatt Hi there .. I'm not sure how to approach this question and I would greatly appreciate it if someone could help me Thanks a bunch . Here's the question : Prove the identity . sin^4x - cos^4x = sin^2x - cos^2x This is very simple. Factor the left hand side, Thus, But,
Thanks a lot =) Now that I look at it .. it is really simple :S .... I have another question if you dont mind answering it ... Prove the indentity . 4/cos^2x - 5 = 4tan^2 x - 1
Originally Posted by asiankatt Thanks a lot =) Now that I look at it .. it is really simple :S .... I have another question if you dont mind answering it ... Prove the indentity . 4/cos^2x - 5 = 4tan^2 x - 1 Express left hand side as, Factor, and use reciprocal identity, But, Thus,
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