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Recent questions tagged trigonometrical identities
+2
votes
1
answer
The value of cos36° cos42° cos78° is
asked
Apr 7, 2019
in
JEE
by
kratos
trigonometrical identities
trigonometry
jee
class-10
icse
jee mains
+3
votes
1
answer
If sin A + cos A = m and sec A + cosec A = n, show that: n (m^2 - 1) = 2m
asked
Apr 5, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+2
votes
1
answer
Prove the identities: cotA/(1 - tanA) + tanA/(1 - cotA) = cotA + 1 + tanA
asked
Apr 4, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+3
votes
1
answer
Prove: tanA/(1-cotA) + cotA/(1-tanA) = secAcosecA + 1
asked
Mar 26, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+2
votes
1
answer
Show that: tan10° tan15° tan 75° tan80° = 1
asked
Mar 26, 2019
in
JEE
by
kratos
trigonometrical identities
trigonometry
jee
class-10
icse
jee mains
+3
votes
1
answer
Evaluate: cot54°/tan36° + tan20°/cot70° - 2
asked
Mar 18, 2019
in
Class 10
by
kratos
trigonometry
class-10
icse
trigonometrical identities
+1
vote
1
answer
Prove: 1/(tanA + cotA) = cosAsinA
asked
Mar 16, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+3
votes
1
answer
Prove the identities: (1+ tanA + secA) (1 + cotA - cosecA) = 2
asked
Mar 16, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+1
vote
1
answer
If m = a sec A + b tan A and n = a tan A + b sec A, then prove that : m^2 - n^2 = a^2 - b^2
asked
Mar 16, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+1
vote
1
answer
Solve : sin^-1 2a/(1 + a^2) + cos^-1 (1 - b^2)/(1 + b^2) = 2tan^-1 x
asked
Mar 15, 2019
in
Class 12
by
kratos
trigonometrical identities
trigonometric identities
class-10
icse
bseb model set
inverse trigonometric functions
class-12
+2
votes
1
answer
If tan (π/4 + y/2) = tan^3(π/4 + x/2), prove that
asked
Mar 13, 2019
in
JEE
by
kratos
trigonometrical identities
jee
jee mains
+1
vote
1
answer
Prove the identities: sec^4A(1 - sin^4A) - 2tan^2A = 1
asked
Mar 13, 2019
in
Class 10
by
kratos
trigonometrical identities
trigonometric identities
class-10
icse
+3
votes
1
answer
Evaluate: cos 26° + cos64° sin 26° + tan36°/cot54°
asked
Mar 12, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
trigonometry
+3
votes
1
answer
Prove that: cosA/1+sinA+(1+sinA)/cosA=2secA
asked
Mar 11, 2019
in
Class 12
by
kratos
trigonometrical identities
trigonometry
class-10
icse
class-12
+1
vote
1
answer
siny= xsin(a+y) ,prove that dy/dx=sina/ 1-2cosa+x^2
asked
Mar 11, 2019
in
JEE
by
kratos
trigonometrical identities
applications of derivatives
differential equations
jee
class-10
icse
jee mains
class-12
+2
votes
1
answer
Prove the identities: cot^2A((secA - 1)/(1 + sinA)) + sec^2A((secA - 1)/(1 + secA)) = 0
asked
Mar 9, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+2
votes
1
answer
Evaluate: |(cos15°, sin15°), (sin 75°, cos 75°)|
asked
Mar 8, 2019
in
Class 12
by
kratos
trigonometrical identities
trigonometry
class-9
class-10
icse
class-12
+3
votes
1
answer
Prove that: 1/(sinA - cosA) - 1/(sinA + cosA) = 2cosA/(2sin2A - 1)
asked
Mar 3, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
+3
votes
1
answer
Find the greatest and least values of (sin^-1 x)^2 + (cos^-1 x)^2.
asked
Feb 28, 2019
in
JEE
by
kratos
trigonometrical identities
jee
jee mains
inverse trigonometric functions
class-12
+2
votes
1
answer
Prove: cosecA/(cosecA-1) + cosecA/(cosecA+1) = 2sec^2A
asked
Feb 28, 2019
in
Class 10
by
kratos
trigonometrical identities
class-10
icse
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