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1 - sin 2a = 49/25
sin 2a = -24/25
(sin a + cos a)² = 1 + sin 2a
(sin a + cos a)² = 1 - 24/25
(sin a + cos a)² = 1/25
sin a + cos a = √1/25 = 1/5 (B)
1 - sin 2a = (7/5)²menjadi 49/25
sin 2a = -24/25
maka :
(sin a + cos a)² = 1 + sin 2a
(sin a + cos a)² = 1 - 24/25
(sin a + cos a)² = 1/25
sin a + cos a = √1/25
=1/5