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Calculus/Trigonometic equation

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Expert: - 3/10/2009


Question
I don't know how to solve this all i need is one solution the problem is cos2x=-1 plese solve this and explain how u did it for me please

Answer

Cosine
Questioner:   jamal
Category:  Calculus
Private:  No
 
Subject:  Pre-Calc Problem
Question:  I don't know how to solve this all i need is one solution the problem is cos2x=-1 plese solve this and explain how u did it for me please

Write  cos t = -1, where t is your 2x

Now use your vast knowledge of trigonometry and the graph of cosine to conclude that  t = pi.

You can handle the rest.

Paul Klarreich

Expertise

All topics in first-year calculus including infinite series, max-min and related rate problems. Also trigonometry and complex numbers, theory of equations, exponential and logarithmic functions. I can also try (but not guarantee) to answer questions on Analysis -- sequences, limits, continuity.

Experience

I taught all mathematics subjects from elementary algebra to differential equations at a two-year college in New York City for 25 years.

Education/Credentials
(See above.)

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