What is the value of tan(45)sin(30) ?

The value of tan(45)sin(30) is 1/2

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tan(45)sin(30)

tan (4 5^{\circ}) sin (3 0^{\circ})

\frac{1}{2}

Decimal Notation

0.5

Solution steps

tan (4 5^{\circ}) sin (3 0^{\circ})

Use the following trivial identity:

tan (4 5^{\circ}) = 1

tan (4 5^{\circ})

tan (x)

periodicity table with

18 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

= 1

Use the following trivial identity:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 0^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{1}{2}

= 1 \cdot \frac{1}{2}

Simplify

= \frac{1}{2}

\frac{tan ( 7 8 ^{\circ} ) + tan ( 4 2 ^{\circ} )}{1 - tan ( 7 8 ^{\circ} ) tan ( 4 2 ^{\circ} )}

sin (23.8 2^{\circ})

- 5 cos (\frac{π}{3})

0.4 sin (1)

sec^{2} (2 9^{\circ}) - cot^{2} (6 1^{\circ})