prove that sin(45+x).sin(45-x)=1/2cos2x
If cosα=0.173 and cosβ= 0.432 with both angles’ terminal rays in Quadrant-I, find the values of cos(α+β)=? cos(α-β)=? Your answers should be accurate to 4 decimal places. please help...
If cosα=0.891 and cosβ=0.577 with both angles’ terminal rays in Quadrant-I, find the values of tan(α+β) Your answers should be accurate to 4 decimal places. please help, thanks!
I am doing sum and difference formulas with sin, cos, and tan. I am doing tan75 with the difference formula. So tan 120-45 I have all the things found I just don't know...
I dont quite remember how to solve this, if anyone could help.
During a polar vortex last winter, the temperatures followed a regular pattern each day for a week: the maximum temperature was –4° F each day at 5:00 pm and the minimum temperature each day was –...
The question is cos -105. I know how to do the process for it but for some reason my answer doesn't have the right negatives. I am getting: √2 + (-√6) -------------- ...
Determine the exact value of cos(Pi/24)???
How do I rewrite (tanθ+secθ)/cosθ in terms of sinθ? (fully simplified)
solve the equation for the solutions over the interval [0 degrees, 360 degrees) 6sec2xtanx=12tanx I am unsure of where to begin.
This question is about to prove some trigonometric identities
Trigonometry Identities and equation
cos(3theta)=-1 solve for exact solutions over the interval [0,360 degrees] I am having trouble finding a place to start.
Please use special angles of the unit circle and any trigonometry identities if used.
prove that tan6.tan42.tan66.tan78=1
Find the exact value algebraically of sin(105°)
cos(2θ) = 1/√2 (1 divided by square root 2) 90° ≤ θ ≤ 180°