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mamaluj [8]
3 years ago
5

Please help me please

Mathematics
1 answer:
zloy xaker [14]3 years ago
7 0

Answer:

they are identical. proved below.

Step-by-step explanation:

  • formula:  sin(t)+sin(s) = 2sin(\frac{t+s}{2} )cos(\frac{t-s}{2} )

using the formula to proof:

sin9a+sin5a

2sin(\frac{9+5}{2})* cos(\frac{9-5}{2})

2sin7a * cos2a

True. proved that they are identical.

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