GENERAL KNOWLEDGE

Detailed explanation-1: -No. The x-component of a vector can be either sin or cos, depending on which angle you are given. Cos always goes with the side of a right triangle that is adjacent to (touches) the given angle.

Detailed explanation-2: -Thus, the cosine function is used to calculate the x-component and the sine function is used to calculate the y-component.

Detailed explanation-3: -Trigonometric functions can be used to determine the precise magnitude of the legs of these triangles. If the angle is the counterclockwise angle rotation from the eastern axis and the vector, then the x-component can be calculated using the cosine function; the y-component can be calculated using the sine function.

Detailed explanation-4: -Assertion :If a body is projected obliquely at angle above horizontal with initial speed v then its speed at the instant when its velocity makes an angle above the horizontal is vcoscos Reason: Horizontal component of velocity of projectile remains constant.