Question

Tolong dong yang nomer 23 kawan..

Answer 1

Nggak tahu sini nggak tahu

Answer 2

Sin a cos a = 8/25

(cos a - sin a)^2 = cos^2 a - 2cosa sin a + sin^2 a
(cos a - sin a)^2 = sin^2 a + cos^2 a - 2 sin a cos a
(cos a - sin a)^2 = 1 - 2(8/25)
(cos a - sin a)^2 = 1 - 16/25
(cos a - sin a)^2 = 9/25
cos a - sin a = 3/5

1/sin a - 1/cos a = (cos a - sin a)/(sin a cos a) = (3/5) / (8/25) = 3/5 . 25/8 = 15/8