cos5A cos6A+sin5A sin6A
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1
Answer:
Step-by-step explanation:
its of the form of the formula cos(m-n)
using above gives u cos(6A-5A) = cosA
and formula is cos m cosn + sinm sin n = cos(m-n)
remember this formula
hopr u get it mate.................
Answered by
2
Answer:
here, formula is used, formula is[ cos (A - B) ]
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