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sin x cos x = sin x 2 sin x = 2 sin x sin x = 2 x
semoga membantu..
maaf kalau ada kesalahan..
jadikan yang terbaik yaa..
sinx/cosx = 1/2
tanx = 1/2
depan/samping = 1/2
karena diketahui 2 sisinya yaitu 1 dan 2, maka sisi miringnya = V(2^2 + 1^2) = V5
sinx = depan/miring = 1/V5
cosx = samping/miring = 2/V5
sinxcosx = (1/V5)(2/V5) = 2/5
Semoga membantu :)