CBSE Class 11-science Answered
IF CosX+SinX=?2.CosX
P.T CosX-SinX=?2.SinX
Asked by chethan U | 22 Jul, 2012, 05:33: PM
Expert Answer
Answer : Given : cosA+ sinA = (underroot2 )*cosA
To prove : cosA - sinA = (underroot2 )*sinA
we have ,
=> (cosA+sinA)2 + (cosA -sinA) = 2
=> ( (underroot 2 ) *(cosA) ) + (cosA-sinA)2 = 2 { using given equation}
=> 2cos2A + (cosA-sinA)2 = 2
=> (cosA-sinA)2 = 2 - 2cos2A
=> (cosA - sinA)2 = 2 ( sin2A ) { using 1 - cos2A = sin2A }
taking the square root both the sides we get ,
=> cosA- sinA = (underroot2 )*sinA
Hence Proved
Answered by | 22 Jul, 2012, 07:41: PM
Concept Videos
CBSE 11-science - Maths
Asked by rajyothi64 | 05 Mar, 2024, 09:49: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by ghoshshawata62 | 04 Mar, 2024, 08:16: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by nayaktapaswini2007 | 29 Feb, 2024, 09:10: AM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by bimanmandal53361 | 15 Jan, 2024, 12:32: AM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by sreyas.katuri | 23 Sep, 2023, 07:12: AM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by 069.pks | 16 Sep, 2023, 10:06: AM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by surekhashriwas01 | 12 Sep, 2023, 08:39: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by mvr23467 | 12 Sep, 2023, 07:52: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by SasipriyaNagappan | 27 Jul, 2023, 07:22: PM
ANSWERED BY EXPERT