document.write( "Question 1132184: Show that\r
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document.write( "(a) (tanx - cosx)/sinxcosx = sec²x - cosec²x\r
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document.write( "(b) sin⁴x + cos⁴x = 1- 2sin²xcos²x \n" );
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Algebra.Com's Answer #749128 by ikleyn(52847)![]() ![]() You can put this solution on YOUR website! .\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " I will solve the part (b) here only, in a shorter way.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "Start with\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "\r \n" ); document.write( "\n" ); document.write( "QED.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |