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a² = b² + c² - 2bc cos(a)
a² = 4 + 25 - 2 . 2 . 5 cos 60
a² = 29 - 10
a² = 19
a = √19
a = silahkan cari sendiri hasil pastinya
mudah2an membantu
The-L
a^ = b^+c^ - 2bc × cos A
selamat mencoba