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cos 165 degrees - cos 75 degrees

use the sum to product formula to find the exact value of

1/2 sec x-1=0, 4 tan ^2 x-1=tan^2x, 4sin^2x-3=0 , 2 cos 2x = square root of 2

solve the equations for 0 ≤ x < 2pie

tan(pie/2-x) cot x / csc^2(-x)-1

use the fundamental identities to simplify the expression

truiangles

A straight road leads from an ocean beach into the nearby hills. The road has a constant upward grade of 7°. After taking this road from the beach for a mile and a quarter, how high above sea level...

Trigonometry Word Problem

a 7.5M Ladder is leaned up against a wall, what angle does the ladder make with the wall if the top of the ladder is 6.6m above the ground?

Trigonometry Word Problem

The distance from a pebble to the base of a vertical cliff is 43m. The angle between the pebble and the top of the cliff is about 57 degrees. What is the height of the Cliff?

Would someone help me answer this trigonometry math word problem and show my work for it? Thanks!

The value of a machine depreciates according to the function f(x) = 20000(1/2)x ,where x is the time in years from the purchase of the machine. What is it's value after 3 years?

Can anyone help me answer these two trigonometry math word problems and show all my work for both?

1. The profit of an organization is calculated by the function P(x) = x2 - 4000x + 7800000, where x is the number of units sold. If the net profit is 3800000, find the number of items sold...

help with this problem?

determine the exact value of sin (5π/8)

may i have some help?

find sin (a-b) if sin (a)= 3/5 where a is in the second quadrant  and cos (b)= 15/17 where b is in the first quadrant   1.) 36/85   2.) 84/85   3.) 13/85   4...

Trigonometry

Solve each of the following equations. (i)   3cos2 2x+ 4 sin2x =1 , 0° < x < 360°   (ii)  sec x (tan x -2) = 2 cosec x , 0° < x < 360°   (iii)...

given cos x=-3/4, with x in quadrant 2. find the remaining five trigonometric functions of x.

I have No idea on what to do.

use the angle sum or difference identity to find the exact value of sin 15 degrees

I don't understand what to do after i the two numbers like (45-30)

Trigonometry Question Help!

Can you help me with my trigonometry 1 question assignment? Can you also provide an explanation to support the answer?   1. What us the slope of any line perpendicular to the line 4x-2y=10...