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Recent questions tagged sine and cosine formulae
+3
votes
1
answer
In any triangle ABC, prove the: a (sin B – sin C) + b (sin C – sin A) + c (sin A – sin B) = 0
asked
Apr 4, 2019
in
Class 11
by
kratos
class-11
sine and cosine formulae
+1
vote
1
answer
For any Δ ABC show that 2(bc cos A + ca cos B + ab cos C) = a^2 + b^2 + c^2
asked
Mar 5, 2019
in
Class 11
by
kratos
class-11
sine and cosine formulae
+1
vote
1
answer
In trangle ABC a^4+b^4+c^4-2c^2(a^2+b^2)=0 proove c=45or135
asked
Mar 3, 2019
in
Class 12
by
kratos
determinants
class-11
sine and cosine formulae
class-12
+3
votes
1
answer
The sides of a triangle are 8 cm, 10 cm and 12 cm. Then the greatest angle is
asked
Feb 16, 2019
in
JEE
by
kratos
trigonometry
class-11
jee
sine and cosine formulae
jee mains
class-12
sequences and series
triangle
+1
vote
1
answer
In any ∆ABC, prove: if a = 18, b = 24, c = 30, find cos A, cos B and cos C
asked
Feb 13, 2019
in
Class 11
by
kratos
class-11
sine and cosine formulae
+1
vote
1
answer
If x = √3 + √2/ √3- √2 and y=1 the value of x-y/x-3y is (A) 5/√5-4 (B) 5/√6+4 (C) √6-4/5 (D) √6+4/5
asked
Feb 5, 2019
in
Class 11
by
kratos
number-system
class-11
rationalisation
class-9
sine and cosine formulae
+3
votes
1
answer
If a,b,c are in A.P. then |(x + 2, x + 3, x + 2a),(x + 3, x + 4, x + 2b), (x + 4, x + 5, x + 2c)|
asked
Jan 26, 2019
in
Class 12
by
kratos
class-11
scalar triple product
determinants
sine and cosine formulae
vector
class-12
+1
vote
1
answer
If a , b , c are in A.P. , then a + 1/bc, b + 1/ca, c + 1/ab are in: (A) A.P. (B) G.P.
asked
Jan 19, 2019
in
Class 11
by
kratos
class-11
locus
class-10
coordinate geometry
sine and cosine formulae
+1
vote
1
answer
If in triangle ABC sin^2A+sin^2B+sin^2C=2 then what type of triangle is ABC ?
asked
Jan 14, 2019
in
JEE
by
kratos
nda
properties of triangles
class-11
jee
matrices
determinants
sine and cosine formulae
jee mains
class-12
+2
votes
1
answer
If y = x^2sin(x^3) then ∫ydx will be : (A) - cos(x^3) + c (B) - (cosx^3/3) + C
asked
Dec 28, 2018
in
JEE
by
kratos
trigonometry
class-11
jee
matrices
determinants
sine and cosine formulae
jee mains
integrals
class-12
trigonometric functions
+1
vote
1
answer
if 2sin^2 A-cos^2 A=2 then find the value of A
asked
Dec 7, 2018
in
Class 11
by
kratos
class-11
transformation formulae
trigonometric identities
class-10
sine and cosine formulae
trigonometric functions
+1
vote
1
answer
In triangle ABC, if (sin^2A + sin^2B + sin^2C)/(cos^2A + cos^2B + cos^2C) = 2 then the triangle is
asked
Dec 5, 2018
in
JEE
by
kratos
nda
properties of triangles
class-11
jee
determinants
sine and cosine formulae
jee mains
class-12
+2
votes
1
answer
Prove that (1 + tan A – sec A) × (1 + tan A + sec A) = 2 tan A
asked
Dec 3, 2018
in
Class 11
by
kratos
sine and cosine formulae
class-11
transformation formulae
trigonometric functions
+1
vote
1
answer
In ∆ABC, if a = 18, b = 24 and c = 30 and ∠C = 90°, find sin A, sin B and sin C.
asked
Dec 2, 2018
in
Class 11
by
kratos
class-11
sine and cosine formulae
+3
votes
1
answer
For any Δ ABC show that: (c - b cos A)/(b - c cos A) = cos B/cos C
asked
Nov 24, 2018
in
Class 11
by
kratos
class-11
sine and cosine formulae
+1
vote
1
answer
Value of cot 60° will be (a) √3
asked
Nov 9, 2018
in
Class 11
by
kratos
trigonometry
class-10
class-11
sine and cosine formulae
+2
votes
1
answer
Cot[52(1/2)]° = ______ (a) √6 + √3 – √2 – 2
asked
Nov 6, 2018
in
JEE
by
kratos
trigonometry
class-11
jee
sine and cosine formulae
jee mains
+2
votes
1
answer
For any ΔABC, show that b(c cos A – a cos C) = c^2 – a^2
asked
Oct 12, 2018
in
Class 11
by
kratos
class-11
sine and cosine formulae
+1
vote
1
answer
If ΔABC is isosceles with A = B and tan A + tan B + tan C = 200 then possible value of [tan A] is (where [.] is
asked
Oct 11, 2018
in
Class 11
by
kratos
class-11
circles
class-9
class-10
icse
sine and cosine formulae
triangles
symmetry
congruent triangles
+1
vote
1
answer
Write a short tourist’* leaflet about any Hill Station that you know with the help of the following points :
asked
Oct 1, 2018
in
Chemistry
by
kratos
ncc
leaf external morphology
class-11
biochemistry
sine and cosine formulae
class-12
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