Odpowiedź:
sin⁴x - cos⁴x = 1
(sin²x - cos²x)(sin²x + cos²x) = 1
cos²x = 1 - sin²x , więc :
(sin²x - 1 + sin²x) * 1 = 1
2sin²x - 1 = 1
2sin²x = 1 + 1 = 2
sin²x = 2/2 = 1
sinx = 1
sinx = sin90⁰
x = 90⁰
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Odpowiedź:
sin⁴x - cos⁴x = 1
(sin²x - cos²x)(sin²x + cos²x) = 1
cos²x = 1 - sin²x , więc :
(sin²x - 1 + sin²x) * 1 = 1
2sin²x - 1 = 1
2sin²x = 1 + 1 = 2
sin²x = 2/2 = 1
sinx = 1
sinx = sin90⁰
x = 90⁰