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genuis asked this question on School Talk

prove that

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tan3A / 1 +tan2A  +cot3A / 1 +cot2A = secA*cosecA -2 sinA*cosA

Asked by genuis(student), on 1/9/10
Answers

Prove that :

tan3A / 1 +tan2A  +cot3A / 1 +cot2A = secA*cosecA -2 sinA*cosA

LHS : tan3A / 1+tan2A  +  cot3A / 1+cot2A

tan3A / sec2A  +  cot3A / cosec2A ( 1+tan2A = sec2A  AND 1+cot2A = cosec2A )

(sin3A / cos3A )* (cos2A / 1)  +  (cos3A / sin3A ) * (sin2A /1)

(sin3A / cosA ) +  (cos3A / sinA ) 

[sin4A + cos4A / cosA sinA ]

[{(sin2A + cos2A) - 2 sin2A cos2A} / cosA sinA ]  (sin4A + cos4A = (sin2x+ cos2x) - 2 sin2x cos2x )  ) 

[(1 - 2 sin2A cos2A} / cosA sinA ] ( sin2A + cos2A = 1 )

{1 / cosA sinA }  - {2 * (sin2A cos2A / cosA sinA) }

secA cosecA -2 sinA cosA

LHS = RHS  (Hence Proved)

 I wish you will be satisfied and give me  thumbs up

Posted by Imad93(student), on 2/9/10

hey but how will u prove that

sin4A +cos4A =sin2 A+ cos2 A -2sin 2A cos2 A

is it a theorem if so   plz  prove that thnx

Posted by genuis(student), on 2/9/10

ok.................

i got that u used a2+b2 =(a+b)2-2ab

Posted by genuis(student), on 4/9/10
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