Sir please solve this[trig functions]:

Asked by krish1092

2cos9xcos7x=2cos5xcos3x and
2sin5xcos3x=2sin9xcos7x

4 Answers

1
skygirl ·

wat has to be done??
proof??
both are diff questions or same question??

62
Lokesh Verma ·

sovle.. get the values of x for which these individual identities hold

1
skygirl ·

ok.

62
Lokesh Verma ·

1) cos8x=-1

2) sin8x=0 or cos8x=1/2

these are fairly simple to reach... just use the sum and difference formula!

After this these are standard identities to solve :)

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