prove that cos7x +cos5x %sin7x +sin5x =cot x
Answers
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Step-by-step explanation:
LHS=
sin7x−sin5x
cos7x+cos5x
=
2sin(
2
7x−5x
)cos(
2
7x+5x
)
2cos(
2
7x+5x
)cos(
2
7x−5x
)
=
sinxcos6x
cos6xcosx
=
sinx
cosx
=cotx=RHS
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