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Choose the correct Sum Formula for cos(35) using 15 and 20.

User Mpsk
by
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1 Answer

3 votes

Given:

We have Cos 35 degree.

Required:

Choose the correct Sum Formula.

Step-by-step explanation:

We will use


Cos(A+B)=CosACosB-SinASinB

Now, We can write Cos (35) as Cos(20 + 15)


\begin{gathered} Cos(20+15)=Cos20Cos15-Sin20Sin15 \\ =0.819 \end{gathered}

Answer:

Hence, question is solved.

User Stephan Olsen
by
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