the value of sin4x + cos4x – 2 sin2x is ……. a. 2 sin2x b. 2 sin x c. 0 d. -1 e. 1?

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the value of sin4x + cos4x – 2 sin2x is ……. a. 2 sin2x b. 2 sin x c. 0 d. -1 e. 1?

the value of sin4x + cos4x – 2 sin2x is …….
a. 2 sin2x b. 2 sin x c. 0 d. -1 e. 1

2007-03-06 19:27:09 · 3 answers · asked by rohan s 1 in Education & Reference ➔ Homework Help

3 answers

sin4x+cos4x-2sin2x
=sin2(2x)+cos2(2x)-2sin2x
=2sin2xcos2x+cos2(2x)-2sin2x
=2sin2x{cos2x-1}+cos2(2x)
=2sin2x{1+2sin square x -1}+cos2(2x)
=2sin2x{2sin sq. X}+cos2(2x)

now try to solve further yourself....

2007-03-06 19:38:30 · answer #1 · answered by Anonymous · 0⤊ 0⤋

2sinx

2007-03-07 03:34:37 · answer #2 · answered by sanjeevi v 1 · 0⤊ 0⤋

ask your teacher..

2007-03-07 03:31:20 · answer #3 · answered by James Bond 1 · 0⤊ 0⤋