Recent questions tagged t- ratios of angles

+3 votes

1 answer

In the adjoining figure, ∆ABC is right-angled at B and ∠A = 30^0 . If BC = 6cm, find (i) AB, (ii) AC.

asked Apr 1, 2019 in Class 10 by kratos

+1 vote

1 answer

Find the value of: tan^-1(tan20) + tan^-1(tan40) + tan^-1(tan60) + tan^-1(tan80)

asked Mar 22, 2019 in JEE by kratos

+1 vote

1 answer

Evaluate: sin60^0 cos30^0 + cos60^0 sin30^0

asked Feb 21, 2019 in Class 12 by kratos

+2 votes

1 answer

If sin(A + B) = 1 and sin (A-B) = 1/2, 0 ≤ A + B ≤ 90^o and A > B, then find A and B.

asked Jan 29, 2019 in Class 12 by kratos

+1 vote

1 answer

Evaluate\(\begin{vmatrix}sin30^o&cos30^o \\[0.3em]-sin60^o & cos60^o \\[0.3em]\end{vmatrix}\)

asked Jan 28, 2019 in Class 12 by kratos

+2 votes

1 answer

In the adjoining figure, ∆ABC is right-angled at B and ∠A = 45^ou200bu200bu200bu200bu200bu200bu200b . If AC = 3√2 cm, find (i) BC, (ii) AB.

asked Jan 22, 2019 in Class 10 by kratos

+1 vote

1 answer

Evaluate: 4/cot^2 30 + 1/ sin^2 30 - 2 cos^2 45 - sin^2 0

asked Jan 20, 2019 in Class 10 by kratos

+1 vote

1 answer

Using the formula, cos A = √ (1+cos 2A)/ 2 , find the value of cos 30 , it being given that cos 60 = 1/2 .

asked Jan 16, 2019 in Class 10 by kratos

+2 votes

1 answer

If 3x = cosecθ = and 3/x = cotθ find the value of 3 (x^2 - 1/x^2)

asked Jan 10, 2019 in Class 10 by kratos

+1 vote

1 answer

Find the value of (cos38 cosec52)/ (tan18 tan35 tan60 tan72 tan55)

asked Jan 4, 2019 in JEE by kratos

+1 vote

1 answer

If A = 30 , verify that: cos 2A = 1− tan^2A/ 1+ tan^2A

asked Dec 19, 2018 in Class 10 by kratos

+2 votes

1 answer

Evalute : ((3tan^2 30^o + tan^2 60^o + cosec 30^o - tan 45^o)/cot^2 45^o)

asked Dec 3, 2018 in Class 11 by kratos

+3 votes

1 answer

In ∆ABC, if AB = 16cm, BC = 12cm and AC = 20cm, then ∆ABC is (a) acute-angled (b) right-angled (c) obtuse-angled

asked Nov 26, 2018 in Class 10 by kratos

+1 vote

1 answer

Show that: cos 30+sin 60/ 1+sin 30+ cos 60 = cos 30

asked Nov 6, 2018 in Class 10 by kratos

+2 votes

1 answer

If A = 60 and B = 30 , verify that: sin (A – B) = sin A cos B – cos A sin B

asked Oct 19, 2018 in Class 10 by kratos

+2 votes

1 answer

Evaluate: 2cos^2 60 + 3 sin^2 45 - 3sin^2 30 + 2 cos^2 90

asked Oct 5, 2018 in Class 10 by kratos

+1 vote

1 answer

Using the formula, tan 2A = 2 tanA/ 1 − tan^2A, find the value of tan 60 , it being given that tan 30 = 1/√3 .

asked Sep 25, 2018 in Class 10 by kratos

+2 votes

1 answer

Evaluate: (5 cos^260°+4 sec^230°− tan^245°)/ (sin^230°+ cos^230°)

asked Sep 6, 2018 in Class 11 by kratos

+3 votes

1 answer

Evaluate: cos60^0 cos30^0− sin60^0 sin30^0

asked Sep 3, 2018 in Class 12 by kratos

+1 vote

1 answer

Using the formula, sin A = √ (1−cos 2A)/ 2 , find the value of sin 30 , it being given that cos 60 = 1/2 .

asked Aug 12, 2018 in Class 10 by kratos

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