What is the value of 2sin(2 pi/2) ?

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2sin(2 pi/2)

2 sin (2 \frac{π}{2})

0

Solution steps

2 sin (2 \cdot \frac{π}{2})

Rewrite using trig identities:

sin (2 \cdot \frac{π}{2}) = 0

sin (2 \cdot \frac{π}{2})

Simplify:

2 \cdot \frac{π}{2} = π

2 \cdot \frac{π}{2}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{π 2}{2}

Cancel the common factor:

2

= π

= sin (π)

Use the following trivial identity:

sin (π) = 0

sin (π)

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= 0

= 0

= 2 \cdot 0

Simplify

= 0

tan (\frac{4}{7})

sin (\frac{- i}{3})

cos (1 + 2)

45 \cdot cos (3 0^{\circ})

sec (6 0^{\circ}) - sin (3 0^{\circ}) + cot (4 5^{\circ})