Question

9. Jika sin x + cos x = 2c, maka cos4 x + sin4 x ...
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A.
1- (2c2 - 1)
-
2
(2c2 - 1)2
D. 1+
2
(4c² – 1)²
E. 1+
2
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1-(4c2 - 12
B. 1-
2
(4c2 - 2)2
C. 1+
2
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