Cosb= A. cosb B. sina C. cosa OD. sinb [sin (a + b) + sin(a - b)] OOO MONETHE

Inoabrian asked May 5, 2023

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Inoabrian asked May 5, 2023

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24 votes

Answer: B. sin a

Step-by-step explanation

• Expression,

$_(---)\cos b=(1)/(2)\left[\sin\left(a+b\right)+\sin\left(a-b\right)\right]$

If we use the properties we get that:

$2\sin a\cos b=\left[\sin\left(a+b\right)+\sin\left(a-b\right)\right]$

Then:

$\sin a\cos b=(1)/(2)\left[\sin\left(a+b\right)+\sin\left(a-b\right)\right]$

Karol S answered May 10, 2023

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