CBSE Class 10 Answered
find the value of cos15. cos16. cos17. ....................cos74. cos75
Asked by saransh.gupta27 | 18 Jan, 2019, 01:08: AM
Expert Answer
let F = cos15 cos16 cos17......................cos74 cos75
F = [ cos15 cos75 ] [ cos16 cos74 ] [ cos17 cos73]....... [cos43 cos47] [cos44 cos46] cos45
F = (30/2) [cos90+cos60][cos90+cos58][cos90+cos56]..............[cos90+cos2] cos45
F = 15 cos60 cos58 cos56.............cos4 cos2 cos45
F = 15 [cos60cos30] [cos58 cos32][cos56 cos34][cos54 cos36][cos52 cos38][cos50 cos40][cos48 cos42][cos46 cos44]cos28 cos26 .......cos4cos2cos45
F = 15×8×(1/2)[cos90+cos30][cos90+cos26].......................................................[cos90+cos6][cos90+cos2]cos28 cos26.......cos4 cos2 cos45
F = 60 cos30 cos26 cos22 cos18 cos14 cos10 cos6 cos2 cos28 cos26 cos24 cos22 cos20 cos18 cos16 cos14 cos12 cos10 cos8 cos6 cos4 cos2 cos45
F = 60×(1/2)×(1/√2) cos28 cos226 cos24 cos222 cos20 cos218 cos16 cos214 cos12 cos210 cos8 cos26 cos4 cos22
Answered by Thiyagarajan K | 20 Jan, 2019, 06:16: PM
Application Videos
-
This video covers an application on distance and height
-
This video describe Relation between HCF and LCM. -
This video explains the concept of Arithmetic Progression, Solving Linear E... -
This video explains the concept of conversion of solids. -
This video explains how to find the volume of a frustum and a cone
Concept Videos
-
This video explains the statement of Euclid's Division lemma and algorithm ... -
Determination of H.C.F and L.C.M of numbers using Prime Factorization and ... -
Discuss rational and irrational numbers and express them on the number lin... -
Types, degree and zeroes of a polynomial. Find number of zeroes of the pol... -
Relationship between zeroes and coefficients of a polynomial. Formation of...
CBSE 10 - Maths
Asked by prasadshruti9999 | 03 Jun, 2023, 10:05: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by Akhandp457 | 29 May, 2023, 09:06: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by dimpaldihingia2 | 24 May, 2023, 06:10: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by akhilthainuan | 22 May, 2023, 02:11: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by ruchipandey20071978 | 21 May, 2023, 10:00: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by ruchipandey20071978 | 21 May, 2023, 09:57: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by ruchipandey20071978 | 21 May, 2023, 05:32: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by ruchipandey20071978 | 21 May, 2023, 05:29: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by ruchipandey20071978 | 11 May, 2023, 06:55: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by gavhanenisha0310 | 09 May, 2023, 04:10: PM
ANSWERED BY EXPERT