emilyburns03 emilyburns03

03-09-2020
Mathematics

contestada

sin 20.sin 10 as sum or difference

Respuesta :

jimrgrant1 jimrgrant1

03-09-2020

Answer:

see explanation

Step-by-step explanation:

The difference identity for the product is

sinxsiny = [tex]\frac{1}{2}[/tex] [ cos(x - y) - cos(x + y) ], thus

sin20sin10

= [tex]\frac{1}{2}[/tex] [ cos(20 - 10) - cos(20 + 10) ]

= [tex]\frac{1}{2}[/tex] ( cos10 - cos30 )

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