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人気のある三角関数 >

cos(4t)=-3/4 ,0<= t<= 2pi

解

cos (4 t) = - \frac{3}{4}, 0 \leq t \leq 2 π

解

t = \frac{2.41885 \dots}{4}, t = \frac{2.41885 \dots + 2 π}{4}, t = \frac{- 2.41885 \dots + 2 π}{4}, t = \frac{2.41885 \dots + 4 π}{4}, t = \frac{- 2.41885 \dots + 4 π}{4}, t = \frac{2.41885 \dots + 6 π}{4}, t = \frac{- 2.41885 \dots + 6 π}{4}, t = \frac{- 2.41885 \dots + 8 π}{4}

+1

度

t = 34.64759 \dots^{\circ}, t = 124.64759 \dots^{\circ}, t = 55.35240 \dots^{\circ}, t = 214.64759 \dots^{\circ}, t = 145.35240 \dots^{\circ}, t = 304.64759 \dots^{\circ}, t = 235.35240 \dots^{\circ}, t = 325.35240 \dots^{\circ}

解答ステップ

cos (4 t) = - \frac{3}{4}, 0 \leq t \leq 2 π

三角関数の逆数プロパティを適用する

cos (4 t) = - \frac{3}{4}

以下の一般解

cos (4 t) = - \frac{3}{4}

cos (x) = - a \Rightarrow x = arccos (- a) + 2 πn, x = - arccos (- a) + 2 πn

4 t = arccos (- \frac{3}{4}) + 2 πn, 4 t = - arccos (- \frac{3}{4}) + 2 πn

4 t = arccos (- \frac{3}{4}) + 2 πn, 4 t = - arccos (- \frac{3}{4}) + 2 πn

解く

4 t = arccos (- \frac{3}{4}) + 2 πn : t = \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

4 t = arccos (- \frac{3}{4}) + 2 πn

以下で両辺を割る

4

4 t = arccos (- \frac{3}{4}) + 2 πn

以下で両辺を割る

4

\frac{4 t}{4} = \frac{arccos ( - \frac{3}{4} )}{4} + \frac{2 πn}{4}

簡素化

t = \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

t = \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

解く

4 t = - arccos (- \frac{3}{4}) + 2 πn : t = - \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

4 t = - arccos (- \frac{3}{4}) + 2 πn

以下で両辺を割る

4

4 t = - arccos (- \frac{3}{4}) + 2 πn

以下で両辺を割る

4

\frac{4 t}{4} = - \frac{arccos ( - \frac{3}{4} )}{4} + \frac{2 πn}{4}

簡素化

t = - \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

t = - \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

t = \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}, t = - \frac{arccos ( - \frac{3}{4} )}{4} + \frac{πn}{2}

範囲の解答

0 \leq t \leq 2 π

t = \frac{arccos ( - \frac{3}{4} )}{4}, t = \frac{arccos ( - \frac{3}{4} ) + 2 π}{4}, t = \frac{- arccos ( - \frac{3}{4} ) + 2 π}{4}, t = \frac{arccos ( - \frac{3}{4} ) + 4 π}{4}, t = \frac{- arccos ( - \frac{3}{4} ) + 4 π}{4}, t = \frac{arccos ( - \frac{3}{4} ) + 6 π}{4}, t = \frac{- arccos ( - \frac{3}{4} ) + 6 π}{4}, t = \frac{- arccos ( - \frac{3}{4} ) + 8 π}{4}

10進法形式で解を証明する

t = \frac{2.41885 \dots}{4}, t = \frac{2.41885 \dots + 2 π}{4}, t = \frac{- 2.41885 \dots + 2 π}{4}, t = \frac{2.41885 \dots + 4 π}{4}, t = \frac{- 2.41885 \dots + 4 π}{4}, t = \frac{2.41885 \dots + 6 π}{4}, t = \frac{- 2.41885 \dots + 6 π}{4}, t = \frac{- 2.41885 \dots + 8 π}{4}

グラフ

人気の例

cos (x) = 0.71

cos (x) = 0.28

2 sin (θ) - 3 = - 2

cos(x)+2sec(x)=-3

cos (x) + 2 sec (x) = - 3

0 = \frac{1}{5} sin (5 t)