If Cos(A+B)/cos(A-B) =sin(C+D)/sin(C-D). Prove that tanA …
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Daksh Khosla 6 years, 3 months ago
( cosAcosB - sinAsinB) (sincCosD- cosC sinD) = ( cosAcosB + sinAsinB) (sincCosD+ cosC sinD)
- cosA cosBcosCsinD - sinA sinB sinC cosD = cosA cosB cosC sinD + sinA sinB sinC cosD
2 cosA cosBcosCsinD + 2sinA sinB sinC cosD=0
sinA sinB sinC cosD = - cosA cosBcosCsinD
tanA tanB tanC = - tanD
tannA tanB tanC + tanD =0
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