Given sin x = 8/10, 90° <x< 180° and tan y = -12/5, 270° ≤y≤ 360°. Without finding the values for angle x and y, determine cos x cos y + sin x sin y / tan x - tan y.

Step-by-step explanation:

Given

x lies in the second quadrant where sin and cosec is positive and rest trigonometric functions are negative

so,

similarly,

Also, y lies in 4 th Quadrant where cos and sec is positive and rest trigonometric functions are negative

Now putting the values

=

answer: huh

step-by-step explanation:

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)