trignometry class 10

(sin A−2 sin3A)/ (2 cos3A−cos A)=

• tan A

• cot A

• sec A

• 1

(cos A / cot A) + sin A= ?

• cot A

• 2 sin A

• 2 cos A

• sec A

Which of the following are Pythagorean triplets?

• 4 cm , 6 cm , 8 cm

• 24 cm , 10 cm , 26 cm

• 13 cm , 27 cm , 30 cm

• 2 cm , 17 cm , 9 cm

The value cot2 30°−2 cos2 60°−3/4 sec2 45°−4 sin2 30° is

• 2

• -1

• 1

• 0

If 5tanθ=4, then value of (5sinθ -4cosθ)/(5sinθ +4cosθ) is:

• 1/6

• 5/6

• 0

• 5/3

If Cosec (A+ B) = 2/√3, sec(A-B)=2/√3

0°<A+B≤90°,

Find A and B.

• 25°,35°

• 30°, 30°

• 45°, 15°

• 10°,50°

(Sin 30°+cos 60°)-(sin 60° + cos 30°) is equal to:

• 0

• 1+2√3

• 1-√3

• 1+√3

sin 2A = 2 sin A is true when A =

• 30°

• 45°

• 0°

• 60°

If sin A = 1/2 , then the value of cot A is

• √3

• 1/√3

• √3/2

• 1

If sin A + sin²A = 1, then the value of the expression (cos²A + cos⁴A) is

• 1

• 1/2

• 2

• 3