Given that cos x° =Sin (3x +10)find tan X°
Mathematics · High School · Thu Feb 04 2021
llm
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Given: cos x° =Sin (3x +10)
We know, Cos a = Sin b when a + b = 90°
hence, x + 3x + 10 = 90°
4x + 10 = 90°
4x = 90-10
4x = 80
dividing both sides by 4, we get
4x/4 = 80/4
x = 20
So, tan 20° = 0.364