What is the value of cos(arcsin(4/5)+pi/3) ?

The value of cos(arcsin(4/5)+pi/3) is 3/10-(2sqrt(3))/5

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cos(arcsin(4/5)+pi/3)

Solution

cos (arcsin (\frac{4}{5}) + \frac{π}{3})

Solution

\frac{3}{10} - \frac{2 3}{5}

Decimal Notation

- 0.39282 \dots

Solution steps

cos (arcsin (\frac{4}{5}) + \frac{π}{3})

Rewrite using trig identities:

cos (arcsin (\frac{4}{5})) cos (\frac{π}{3}) - sin (arcsin (\frac{4}{5})) sin (\frac{π}{3})

cos (arcsin (\frac{4}{5}) + \frac{π}{3})

Use the Angle Sum identity:

cos (s + t) = cos (s) cos (t) - sin (s) sin (t)

= cos (arcsin (\frac{4}{5})) cos (\frac{π}{3}) - sin (arcsin (\frac{4}{5})) sin (\frac{π}{3})

= cos (arcsin (\frac{4}{5})) cos (\frac{π}{3}) - sin (arcsin (\frac{4}{5})) sin (\frac{π}{3})

Rewrite using trig identities:

cos (arcsin (\frac{4}{5})) = \frac{3}{5}

cos (arcsin (\frac{4}{5}))

Rewrite using trig identities:

cos (arcsin (\frac{4}{5})) = 1 - (\frac{4}{5})^{2}

Use the following identity:

cos (arcsin (x)) = 1 - x^{2}

= 1 - (\frac{4}{5})^{2}

= 1 - (\frac{4}{5})^{2}

Simplify

= \frac{3}{5}

Use the following trivial identity:

cos (\frac{π}{3}) = \frac{1}{2}

cos (\frac{π}{3})

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{1}{2}

Rewrite using trig identities:

sin (arcsin (\frac{4}{5})) = \frac{4}{5}

Use the following identity:

sin (arcsin (x)) = x

= \frac{4}{5}

Use the following trivial identity:

sin (\frac{π}{3}) = \frac{3}{2}

sin (\frac{π}{3})

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}

= \frac{3}{2}

= \frac{3}{5} \cdot \frac{1}{2} - \frac{4}{5} \cdot \frac{3}{2}

Simplify

\frac{3}{5} \cdot \frac{1}{2} - \frac{4}{5} \cdot \frac{3}{2} : \frac{3}{10} - \frac{2 3}{5}

\frac{3}{5} \cdot \frac{1}{2} - \frac{4}{5} \cdot \frac{3}{2}

\frac{3}{5} \cdot \frac{1}{2} = \frac{3}{10}

\frac{3}{5} \cdot \frac{1}{2}

Multiply fractions:

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

= \frac{3 \cdot 1}{5 \cdot 2}

Multiply the numbers:

3 \cdot 1 = 3

= \frac{3}{5 \cdot 2}

Multiply the numbers:

5 \cdot 2 = 10

= \frac{3}{10}

\frac{4}{5} \cdot \frac{3}{2} = \frac{2 3}{5}

\frac{4}{5} \cdot \frac{3}{2}

Cross-cancel common factor:

2

= \frac{2}{5} \cdot \frac{3}{1}

Multiply fractions:

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

= \frac{2 3}{5 \cdot 1}

Multiply the numbers:

5 \cdot 1 = 5

= \frac{2 3}{5}

= \frac{3}{10} - \frac{2 3}{5}

= \frac{3}{10} - \frac{2 3}{5}

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Frequently Asked Questions (FAQ)

What is the value of cos(arcsin(4/5)+pi/3) ?
The value of cos(arcsin(4/5)+pi/3) is 3/10-(2sqrt(3))/5