Find the Approximate Value Of $\cos ( - 1.1 )$ Using a Calculator
A)

question 2

Multiple Choice

Find the approximate value of $\cos ( - 1.1 )$ using a calculator

• A) \(- 0.02\)
• B) \(0.99\)
• C) \(0.45\)
• D) \(0.89\)

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Definitions:

Acetals

Chemical compounds formed from the reaction between an aldehyde or ketone and a diol, featuring two ether-like oxygen atoms bonded to the same carbon.

PhLi

Phenyllithium, a strong organolithium reagent used in the formation of carbon-carbon bonds in organic synthesis.

NaBH

Likely refers to a sodium borohydride compound, NaBH4, used as a reducing agent in organic chemistry.

MgBr

Likely a shorthand for a magnesium bromide compound, which can act as a Grignard reagent in organic synthesis.