Ask a Doubt
Request a call back

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

CBSE Class 11-science Answered

prove that cos510 cos 330 + sin390 cos120=-1
Asked by science field | 17 Aug, 2014, 05:17: PM
answered-by-expert Expert Answer
cos space 510 space cos space 330 space plus thin space sin space 390 space cos space 120 space equals space minus 1 C o s space 510 space equals space C o s space left parenthesis 360 plus 150 right parenthesis equals C o s space 150 equals C o s left parenthesis 180 minus 30 right parenthesis equals minus C o s space 30 C o s space 330 space equals space C o s space left parenthesis 360 minus 30 right parenthesis equals C o s space 30 S i n space 390 equals space S i n space left parenthesis 360 plus 30 right parenthesis equals S i n space 30 C o s space 120 equals space C o s space left parenthesis 180 minus 60 right parenthesis equals minus C o s space 60 S o space g i v e n space e q u a t i o n space c h a n g e s space t o minus cos squared 30 minus sin space 30 space cos space 60 equals minus 3 over 4 minus 1 fourth equals minus 1 equals R H S H e n c e space P r o v e d
Answered by Dharma Teja | 17 Aug, 2014, 11:33: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Maths
if cot 4θ+cot2θ=1 prove that sin4θ+ sin2θ =1
Asked by bimanmandal53361 | 15 Jan, 2024, 12:32: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
clear this doubt
question image
Asked by mishraparveen1234 | 15 Jun, 2022, 04:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
If A+B+C=pi , then equality of equation (1/2)(cosA cosB + cosB cosC + cosC cosA) must hold: a) <= 3/2.   b) >=(-3)   c) <=3/8   d) >=(-1)  
Asked by shanujam03 | 03 Oct, 2020, 08:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Q10
question image
Asked by omved0304 | 07 Aug, 2020, 11:24: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Solve question no-4
question image
Asked by richasingh0708.bmps | 23 Jun, 2020, 10:00: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
If the value of cosec x repeats after an interval of 2straight pi,then what is the value of cosec(7straight pi/6)?
Asked by dppanigrahiadv | 26 May, 2020, 07:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Find the value of -cos(30)
Asked by lykanbeast04 | 21 May, 2020, 06:49: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Pls solve.
question image
Asked by pb_ckt | 12 Jun, 2019, 02:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Pls solve
question image
Asked by pb_ckt | 11 Jun, 2019, 03:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
What is trigonometry  
Asked by Singhnitish1475 | 11 May, 2019, 01:46: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×