(1+cotA + tanA)(sinA-cosA)=sinAtanA - cotAcosA

Asked by  | 29th Aug, 2012, 09:03: PM

Expert Answer:

LHS = 
(1 + cotA + tanA)(sinA - cosA)
= sinA + sinAcotA +sinAtanA - cosA - cosAcotA -cosAtanA
= sinA + cosA + sinAtanA -cosA cotA - cosA -sinA
= sinAtanA - cotAcosA
= RHS

Answered by  | 29th Aug, 2012, 10:47: PM

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