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MATH / If a and b are acute angles such that cosa=(3)/(5) and cosb=(5)/(13), then find cos(a+b).

Problem

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problem

If aa and bb are acute angles such that cosa=35\cos a = \frac{3}{5} and cosb=513,\cos b = \frac{5}{13}, then find cos(a+b).\cos (a + b).
Plain-text mathematical notation (without MathML)
If a and b are acute angles such that cosa=(3)/(5) and cosb=(5)/(13), then find cos(a+b).
Original LaTeX notation
If $a$ and $b$ are acute angles such that $\cos a = \frac{3}{5}$ and $\cos b = \frac{5}{13},$ then find $\cos (a + b).$

level

Level 2

type

Precalculus

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Source and history

task_id
ec6bcfad-ef60-567d-a0fa-5905835cd998
task_key
precalculus--test--ec6bcfad-ef60-567d-a0fa-5905835cd998
task_revision_id
1
config / split
precalculus / test

Official source

initial import