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Irina-Kira [14]
3 years ago
12

Sin 20.sin 10 as sum or difference

Mathematics
1 answer:
Zielflug [23.3K]3 years ago
6 0

Answer:

see explanation

Step-by-step explanation:

The difference identity for the product is

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

sin20sin10

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

= \frac{1}{2} ( cos10 - cos30 )

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The sum of three numbers is 113 . The second number is 3 times the third. The first number is 7 less than the third . What are t
OLga [1]
Number 1 = 17
number 2 = 72
number 3 = 24


work:

the three numbers are symbolized as x, y, and z

x + y + z = 113

number 2 (y) is 3 times the third number (z) so 

y = 3z

so x + 3z + z = 113

the first number (x) is 7 less than than the third number (z) so

x = z - 7

so z -7 + 3z + z = 113

5z - 7 = 113
5z = 120

z = 24

x = 17
y = 72

Hope this helped :)
8 0
3 years ago
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xeze [42]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
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prisoha [69]
Nope. Your problem is not irrational
4 0
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