Practice Questions on Cos (a + b)
Some practice questions on cos(A + B) formula are given below:
Q1: Find the value of cos(105°).
Q2:Prove that cos(45°) is equal to 1/√2.
Q3: Find the value of cos(135°).
Q4: Find the value of cos(2x + y).
Q5: Find the value of cos(π/4 + π/6).
Cos (a+ b) Formula
Cos (a + b) is one of the important trigonometric identities, cos (a + b) is also called the cosine addition formula in trigonometry. Cos(a+b) is given as, cos (a + b) = cos a cos b – sin a sin b. In this article, we will learn about, cos(a + b), Proof of this Identity, How to Apply cos(a + b) Formula, and Others in detail.
Formula for Cos (a + b) is,
Cos(a + b) = cos a cos b – sin a sin b
Table of Content
- Trigonometry Identities
- What is Cos(a + b)?
- Cos(a + b) Formula
- Cos(a + b) Compound Angle Formula
- Some Similar Formulas to Cos(a+b)
- Cos(a + b) Formula Proof
- How to Apply Cos(a + b) Formula?
- Cos(a + b) Examples
- Practice Questions on Cos (a + b)
- Cos (a + b) – FAQs
- What is Formula of Cos(a + b)?
- What is Formula of Cos(a – b)?
- What is sin (A – B) Formula?
- What is cos (-θ)?