Answers

  • Brainly User
2015-05-14T07:56:18+05:30
SinA + sin²A = 1
sin A= 1 - sin²A
sinA = cos² A 
ur question is cos²A + cos∧4
put value  
cos²A= sin A 
sin A + sin²A = 1 true ans and i hope u will satisfy with this it is an easy and simple trik to solve it :) 
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