Cos(θ - pi) = -cos θ ¿Cuál es el proceso? What´s the process? solo pude resolver esto, I could only solve this cos θ * cos pi + sen θ * sen pi cos θ * cos pi + cos (pi/2 - pi/1) * cos ( pi/2 - θ) cos θ * cos pi + cos ( -2pi/2) * cos (pi/2 - θ) cos θ * cos pi - cos pi * cos (90° - θ) cos θ * cos (90°- θ) cos θ * ( cos 90° - cos θ) cos θ * (0 - cos θ) cos θ * - cos θ -cos θ² = - cos θ no se en que me equivoque o que me falto I don´t know what I'm wrong

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun

the easiest way to do these would be to solve the equations. if you can solve the equation than you can solve these problems.