Mathematics: What is the missing reason in step 8? pythagorean theorem definition of cosine substitution properties of multiplication8.a2 = b2 – 2bccos(a) + c2 8.?

What is the missing reason in step 8? pythagorean

jaylaa04

15.03.2022

Pythagorean theorem is used only for the right angled triangles.

For ΔABC,

Cosine rule is

a^2=b^2 + c^2-2bc$ cosA $

b^2=a^2 + c^2-2ac$ cosB $

c^2=a^2 + b^2-2ab$ cosC $

Here we have used one of these formulae

Hence definition of cosine or Cosine rule is the right answer

Option 2) is the right answer

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angelteddy033

25.02.2023

5n = 30 + 3(n - 4)

Step-by-step explanation:

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