Trigonometry Answers

proof identity (1-tanA)/(1+tanA)=(cos2A)/(1+sin2A)

How do i prove tan(theta)+cot(theta)/sec(theta)csc(theta)=1?

Proove this identities
Sin(a+b) / cos(a-b) = tan a + tan b / 1 + tan a * tan b

prove that cos10°- sin10° / cos 10°+ sin 10°= tan 35°

Find an algebraic expression for sin[arccos(3x)]. PLEASE show the steps

(1+tan1)(1+tan2)................(1+tan45)?

Find the area of a triangle bounded by the lines y=x, y=-x, and y=6?

Given y=Acos(Bx+C) + D. Throughout the day the depth of water at the end of a pier varies with the tides. High tide occurs at 4 am with a depth of 6 meters. Low tide occurs at 10 am with a depth of 2 meters. Model the problem by using the given trigonometric equation to show the depth of the water t hours after midnight showing all your work.

Solve the problem by finding the depth of the water at noon, explaining, the reasoning.