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Help With This Algebra Question

Help With This Algebra Question class=

Sagot :

sqdancefan

9514 1404 393

Answer:

  (d) ±√15/4

Step-by-step explanation:

Useful trig identities are ...

  cos(x) = 1/sec(x)

  sin(x) = ±√(1 -cos²(x))

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Using these, we see that ...

  sin(θ) = ±√(1 -(1/sec²(θ))) = ±√(sec²(θ) -1)/sec(θ)

  sin(θ) = ±√(4² -1)/4 = ±√15/4

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