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Popular >

80cos(45)

Solution

80 cos (4 5^{\circ})

Solution

402

+1

Decimal Notation

56.56854 \dots

Solution steps

80 cos (4 5^{\circ})

Use the following trivial identity:

cos (4 5^{\circ}) = \frac{2}{2}

cos (4 5^{\circ})

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

= \frac{2}{2}

= 80 \cdot \frac{2}{2}

Simplify

80 \cdot \frac{2}{2} : 402

80 \cdot \frac{2}{2}

Multiply fractions:

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

= \frac{2 \cdot 80}{2}

Divide the numbers:

\frac{80}{2} = 40

= 402

= 402

Popular Examples

800 cos (6 0^{\circ})

cot(arcsin(-8/9))

cot (arcsin (- \frac{8}{9}))

tan(arccos(0.7))

tan (arccos (0.7))

arctan((6.6)/(10))

arctan (\frac{6.6}{10})

35 cos (6 0^{\circ})

Frequently Asked Questions (FAQ)

What is the value of 80cos(45) ?
The value of 80cos(45) is 40sqrt(2)