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Sin 20.sin 10 as sum or difference
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Sin 20.sin 10 as sum or difference

User ElGeekalpha
by
4.9k points

1 Answer

2 votes

Answer:

see explanation

Explanation:

The difference identity for the product is

sinxsiny =
(1)/(2) [ cos(x - y) - cos(x + y) ], thus

sin20sin10

=
(1)/(2) [ cos(20 - 10) - cos(20 + 10) ]

=
(1)/(2) ( cos10 - cos30 )

User Nims
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