Please solve this question. We have to find general solutions for this equation

[shut burrow]

1. Ask your question and show the work you've done so far. If you've posted a screenshot of a question, specify which part you need help with.
2. Wait patiently for a helper to come along.
3. Once someone helps you, say thank you and close the thread with:

   +close
   

4. Feel free to nominate the person for helper of the week in #helper-nominations
5. Do not ping the mods, unless someone is breaking the rules.
6. If you're happy with the help you got here, and the server overall, you can contribute financially as well:

[agile grail]

remember the cofunction identity:

sin(a) = cos(π/2 - a)

furthermore, sine and cosine have a period of 2pi.

cos(b) = cos(b + 2nπ)

combine these two identities:

sin(a) = cos(π/2 - a + 2nπ)

you can use this to solve:
cos15x = sin5x by letting a = 5x

[sage spoke]

fellow kee aspirant here