If cos 9α = sin a and 9α < 90°, then the value of tan 5α is

sin (45° + θ) – cos (45° – θ) is equal to

If sin x + cosec x = 2, then sin¹⁹x + cosec²⁰x =

If sin θ – cos θ = 0, then the value of (sin⁴θ + cos⁴θ) is

If tan A + cot A = 4, then tan⁴A + cot⁴A =

1

0

2

1/2`

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