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Proving Trigonometry Identities For The Following Problemsin(Xy)/Cos X Cos Y = Tan Xtan Yi Would

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NOTES
we have to prove that
sin ( x – y )
= tanx – tany
Cost cosy
Ans. Consider Left hand side (LHS )
LIS = Sin (a-y )
cost. cosy
= Sink . cosy – cosx sin y
cost. cosy
= sink cosy
cost singy
Cost -…Trigonometry