david18 said:Homework Statement
"Find the least positive value of the angle A for which:
cosA = sinA and both are negative."
Im having some trouble on this one as usually i would be given cosA=-0.2 or something but this has no figures... Any help?
david18 said:it says cosA=sinA meaning that sin225 is equal to whatever cos225 equals (i checked on calcualtor and they were the same.
The answer book also said 225 so I am pretty sure its right
Trigonometry is a branch of mathematics that deals with the study of triangles and the relationships between their sides and angles. It is used to find missing angles or sides of a triangle when given enough information about the other angles and sides.
The purpose of finding the appropriate angle in trigonometry is to solve problems involving triangles and other geometric shapes. It is used in various fields such as engineering, physics, and astronomy to calculate distances, heights, and angles.
The three main trigonometric functions are sine, cosine, and tangent. These functions are used to relate the angles of a triangle to its sides. Sine is the ratio of the side opposite the angle to the hypotenuse, cosine is the ratio of the adjacent side to the hypotenuse, and tangent is the ratio of the opposite side to the adjacent side.
To find the appropriate angle using trigonometry, you will need to know at least two sides of the triangle and one angle. Then you can use the appropriate trigonometric function (sine, cosine, or tangent) to calculate the missing angle.
Trigonometry has many practical applications, some of which include navigation, surveying, and construction. It is also used in fields such as architecture, astronomy, and engineering to calculate heights, distances, and angles.