Jerry787354
Answered

Explore Westonci.ca, the leading Q&A site where experts provide accurate and helpful answers to all your questions. Join our platform to get reliable answers to your questions from a knowledgeable community of experts. Our platform provides a seamless experience for finding reliable answers from a network of experienced professionals.

please help me please

[tex]2 \sin7 \alpha .cos2 \alpha = sin9 \alpha + sin5 \alpha [/tex]
it's a prove that​

Sagot :

fieryanswererft

Answer:

they are identical. proved below.

Step-by-step explanation:

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

using the formula to proof:

[tex]sin9a+sin5a[/tex]

[tex]2sin(\frac{9+5}{2})* cos(\frac{9-5}{2})[/tex]

[tex]2sin7a * cos2a[/tex]

True. proved that they are identical.

We appreciate your time on our site. Don't hesitate to return whenever you have more questions or need further clarification. We appreciate your time. Please revisit us for more reliable answers to any questions you may have. Stay curious and keep coming back to Westonci.ca for answers to all your burning questions.