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인기 있는 삼각법 >

sin(30)cos(60)-sin(60)cos(30)

해법

sin (3 0^{\circ}) cos (6 0^{\circ}) - sin (6 0^{\circ}) cos (3 0^{\circ})

해법

- \frac{1}{2}

+1

소수

- 0.5

솔루션 단계

sin (3 0^{\circ}) cos (6 0^{\circ}) - sin (6 0^{\circ}) cos (3 0^{\circ})

다음과 같은 사소한 아이덴티티 사용:

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

sin (3 0^{\circ})

sin (x)

주기율표

36 0^{\circ} n

주기:

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}

다음과 같은 사소한 아이덴티티 사용:

cos (6 0^{\circ}) = \frac{1}{2}

cos (6 0^{\circ})

cos (x)

주기율표

36 0^{\circ} n

주기:

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{1}{2}

다음과 같은 사소한 아이덴티티 사용:

sin (6 0^{\circ}) = \frac{3}{2}

sin (6 0^{\circ})

sin (x)

주기율표

36 0^{\circ} n

주기:

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{3}{2}

다음과 같은 사소한 아이덴티티 사용:

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

cos (3 0^{\circ})

cos (x)

주기율표

36 0^{\circ} n

주기:

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{3}{2}

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

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

간소화하다 :

- \frac{1}{2}

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

\frac{1}{2} \cdot \frac{1}{2} = \frac{1}{4}

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

다중 분수:

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

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

숫자를 곱하시오:

1 \cdot 1 = 1

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

숫자를 곱하시오:

2 \cdot 2 = 4

= \frac{1}{4}

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

\frac{3}{2} \cdot \frac{3}{2}

다중 분수:

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

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

33 = 3

33

급진적인 규칙 적용:

a a = a

33 = 3

= 3

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

숫자를 곱하시오:

2 \cdot 2 = 4

= \frac{3}{4}

= \frac{1}{4} - \frac{3}{4}

규칙 적용

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

= \frac{1 - 3}{4}

숫자를 빼세요:

1 - 3 = - 2

= \frac{- 2}{4}

분수 규칙 적용:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{2}{4}

공통 요인 취소:

2

= - \frac{1}{2}

= - \frac{1}{2}

인기 있는 예

cos (2 π - \frac{π}{4})

arcsin (0.9779)

3 sin (3 8^{\circ})

sin (arcsec (1))

(29.7)cos(26.8)(1.71)-5sin(30)(1.71)^2

(29.7) cos (26. 8^{\circ}) (1.71) - 5 sin (3 0^{\circ}) (1.71)^{2}