Posted by eddy on Wednesday, January 2, 2013 at 1:15pm.
6.Prove that tan y cos^2 y + sin^2y/sin y = cos y + sin y
10.Prove that 1+tanθ/1tanθ = sec^2θ+2tanθ/1tan^2θ
17.Prove that sin^2wcos^2w/tan w sin w + cos w tan w = cos wcot w cos w
23.Find a counterexample to shows that the equation sec a – cos a = sin a sec a is not an identity.

trigonometry help me  Steve, Wednesday, January 2, 2013 at 2:17pm
you gotta add some parentheses, so we can tell what's the numerator and what's the denominator.
For #23, just pick an easy value, like pi/4:
√2  1/√2 =?= 1/√2 * √2
No.
Answer This Question
Related Questions
 Trigonometry  1.Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two ...
 trignonmetry  6. Prove that tan λ cos^2 λ + sin^2λ/sin λ = ...
 trig help much appreciated! :))  1. Find the complete exact solution of sin x...
 Trigonometry desperate help, clueless girl here  2. solve cos 2x3sin x cos 2x=...
 trigo math  7. Prove that tan B sin B + cos B = sec B. 11. Prove that tan&#...
 precalculus  For each of the following determine whether or not it is an ...
 Math  Calculus  The identity below is significant because it relates 3 ...
 Trig  Given: cos u = 3/5; 0 < u < pi/2 cos v = 5/13; 3pi/2 < v < ...
 Mathematics  Trigonometric Identities  Let y represent theta Prove: 1 + 1/tan^...
 PRECALC  solve the equation 1. cos(θ) − sin(θ) = 1 2.2 cos(&#...
More Related Questions