Answers

2016-02-19T20:00:47+05:30
sin^4+cos^4

 = sin^4+cos^4 - 2sin^2cos^2 + 2sin^2cos^2

= (sin^2 - cos^2)^2 + 2sin^2cos^2

 = [tex]sinA = cosA

=)Tan a = 1

=) a = 45  2sin^2acos^2a = 2sin^245cos^245                           = 2 *1/2*1/2 = 1/2  [/tex]
sin^4+cos^4 = 1/2

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sr/md thnk u so much but ans is 1/2 in the book
OOps silly errorBtw i am a stud. like you
Tan a = 1