📏 trigonometry

1. **Énoncé du problème** : Dans un triangle, l'angle au sommet vaut 0,6°. Les côtés adjacents à cet angle sont $b=200$ m et $c$ est supérieur à $b$ de 0,1 %. Il faut calculer le t

1. The problem is to find $\sin^{-1}(\cos 60^\circ)$.\n\n2. Recall that $\cos 60^\circ = \frac{1}{2}$.\n\n3. So the expression becomes $\sin^{-1}\left(\frac{1}{2}\right)$.\n\n4. Th

1. Convert from degrees to radians. The formula to convert degrees to radians is:

1. **Problem:** In triangle ABC, given angles $c=36^\circ$, $B=24^\circ$, and side $a$ unknown, find angles $A$, sides $b$, and $c$. 2. **Formula:** Use the triangle angle sum rule

1. The problem asks to find the value of $q^2 - 2pq$ where $p$ is the minimum value and $q$ is the maximum value of the function $$f(x) = 3 \sin\left(x - \frac{\pi}{4}\right) + 5.$

1. **Problem statement:** Find the quadrant in which the rotating line OP lies for the angle $\frac{7\pi}{6}$ and find the acute angle that OP makes with the x-axis. 2. **Formula a

1. **State the problem:** Calculate the value of the expression $$\frac{12 \sin 40^\circ}{\sin 96^\circ}$$. 2. **Formula and rules:** This expression uses the sine function from tr

1. Given the triangle with sides $a=8$, $b=10$, and $c=12$, we want to find angle $C$ opposite side $c$. 2. Use the Law of Cosines formula: $$c^2 = a^2 + b^2 - 2ab \cos C$$

1. **State the problem:** We want to find the angle $C$ in a triangle using the Law of Cosines. 2. **Formula:** The Law of Cosines states:

1. The problem is to evaluate the expression $$9.56 \times \sin 128^\circ \div \sin 19^\circ$$. 2. We use the formula for sine values and division:

1. **State the problem:** Calculate the value of the expression $$\frac{16 \sin 19^\circ}{\sin 33^\circ}$$. 2. **Formula and rules:** This expression uses the sine function from tr

1. **Problem:** Given a right triangle with sides 12 (adjacent to angle $\alpha$) and 5 (opposite to angle $\alpha$), find $\sin \alpha$, $\cos \alpha$, and $\tan \alpha$. 2. **For

1. **State the problem:** We are given a triangle with side $a=27$, angle $A=102^\circ$, angle $B=28^\circ$, and side $b$ opposite angle $B$. We need to find $b$ using the Law of S

1. **Problem Statement:** Given three triangles ABC with angle $A$ and sides $a$, $b$, and $c$ as described, find all possible triangles using the Ambiguous Case (SSA) of the Law o

1. **Problem 1:** Given $A=40^\circ$, $B=80^\circ$, and $a=15$ cm, find $b$. 2. **Formula:** The Law of Sines states:

1. **Problem 1:** Given $A=40^\circ$, $B=80^\circ$, and $a=15$ cm, find $b$. 2. **Formula:** Law of Sines states $$\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C}.$$ We use

1. **State the problem:** Given angles $A=40^\circ$, $B=80^\circ$, and side $a=15$ cm, find side $b$ using the Law of Sines. 2. **Recall the Law of Sines formula:**

1. The problem is to find the length $f$ in a right-angled triangle where the angle adjacent to $f$ is $56^\circ$ and the hypotenuse is $5.7$ cm. 2. Use the cosine formula: $$\cos(

1. The problem involves a right-angled triangle with an angle of 64° and sides labeled 5.8 m and u. 2. We need to determine which equation is correct: A) $\sin 64^\circ = \frac{5.8

1. Given that \( \sin \theta = \frac{4}{5} \), we need to find \( \tan \theta \) and \( \cos \theta \). 2. Recall the Pythagorean identity:

1. **State the problem:** Prove that $$\cos\frac{2\pi}{7} + \cos\frac{4\pi}{7} + \cos\frac{6\pi}{7} = -\frac{1}{2}$$. 2. **Recall the formula for sum of cosines of equally spaced a