Solve 4cos(5x)=3 for the smallest positive solution. Give your answer accurate to at least two decimal places. 

20 True or False 1 point Verify that \( \frac{\sec x \sin x}{\csc x \cos x}=\tan ^{2} x \) is an identity. True False

Jefine la cotangente de un ángulo agudo de un triángulo rectángulo

\( \left. \begin{array} { l } { \angle B = 57 ^ { \circ } 20 ^ { \prime } , \angle C = 43 ^ { \circ } 39 ^ { \prime } , b = 18 } \\ { \angle A = 63 ^ { \circ } 24 ^ { \prime } , \angle C = 37 ^ { \circ } 20 ^ { \prime } , c = 32.4 } \\ { \angle A = 85 ^ { \circ } 45 ^ { \prime } , \angle B = 26 ^ { \circ } 31 ^ { \prime } , c = 43.6 } \\ { \angle C = 49 ^ { \circ } , \angle A = 54 ^ { \circ } 21 ^ { \prime } , a = 72 } \\ { \angle B = 29 ^ { \circ } , \angle C = 84 ^ { \circ } , b = 12.3 } \\ { \angle A = 32 ^ { \circ } , \angle B = 49 ^ { \circ } , a = 12 } \\ { a = 5 , \angle A = 32 ^ { \circ } , b = 8 } \\ { c = 13 , b = 10 , \angle C = 35 ^ { \circ } 15 ^ { \prime } } \\ { \angle B = 56 ^ { \circ } 35 ^ { \prime } , b = 12.7 , a = 9.8 } \\ { a = 9 , c = 11.5 , \angle C = 67 ^ { \circ } 21 ^ { \prime } } \\ { a = 15 , b = 16 , c = 26 } \\ { a = 32.4 , b = 48.9 , c = 66.7 } \\ { a = 100 , b = 88.7 , c = 125.5 } \\ { a = 15 , b = 12 , c = 20 } \\ { a = 12 , b = 15 , \angle C = 68 ^ { \circ } } \\ { a = 28 , c = 32 , \angle B = 76 ^ { \circ } } \\ { b = 45 , c = 75 , \angle A = 35 ^ { \circ } } \\ { a = 12.6 , b = 18.7 , \angle C = 56 ^ { \circ } } \end{array} \right. \)

...f \( (\mathrm{x})=0,5 \sin (\mathrm{x}) \) parallel zur Gerade \( \mathrm{y}=-0,25 \mathrm{x}+3 \) ? \( \square 0 \quad \square \frac{\pi}{3} \square 0,5 \pi \quad \square \frac{2}{3} \pi \) \( \square \pi \quad \square \frac{1}{3} \pi \quad \square 1,5 \pi \quad \square 1 \frac{2}{3} \pi \)

3. Du vet att \( \boldsymbol{\operatorname { c o s }} \mathbf{v}=\mathbf{0 , 5 5} \). Beräkna vinkeln.