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Mathematics
Hana Davies
14 February, 06:30
Find cosФ if tanФ = 1/2
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Gustavo Herrera
14 February, 10:09
0
cosФ = 2√5/5.
Step-by-step explanation:
We have a right angled triangle here with the legs = 1 and 2.
So, by Pythagoras, the hypotenuse = √ (1^2 + 2^2)
= √5
As the tan of Ф = opposite / adjacent = 1 / 2 then the cosine is adjacent / hypotenuse = 2/√5 or 2√5/5.
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