Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

find the value of : sin(n+1)x.sin(n+2)x+cos(n+1)x.cos(n+2)x
Asked by | 02 Mar, 2013, 09:54: AM
Expert Answer
Since sinA.sinB + cosA.cosB = cos (A-B)
so, here  sin(n+1)x.sin(n+2)x+cos(n+1)x.cos(n+2)x    = cos ( (n+2)x - (n+1)x )
= cos(x) 
Answered by | 02 Mar, 2013, 10:01: AM
CBSE 11-science - Maths
Asked by soumyadas098h | 02 Nov, 2022, 08:01: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by mishraparveen1234 | 15 Jun, 2022, 04:56: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by karthikeyainuguri2009 | 10 Apr, 2022, 03:01: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by sinchanaandavan | 02 Jan, 2022, 12:17: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by vermahiteshi243 | 30 Aug, 2021, 09:53: AM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by jgftudx6545 | 29 Nov, 2020, 08:00: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by nareshpanchal76 | 07 Oct, 2020, 10:13: AM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by bandlapravalika4 | 25 Sep, 2020, 01:32: PM
ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by apnp31 | 21 Sep, 2020, 12:19: PM
ANSWERED BY EXPERT
Get FREE Sample Mock Papers for Final Exams
Download Now
×