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Verified answer
1. Nilai dari tg (180+a)Karena (180+a) di kuadran 3 maka nilai tg positif.
So,
tg (180+a) = tg a
2. Cos^2 45 + sin^2 45 =...
Dari rumus trigonometri
Cos^2 a + sin^2 a = 1
Maka, 45 derajat berperan sebagai a.
So,
cos^2 45 + sin^2 45 = 1