Thread: trigonometry equationsss =(

hii guyz, i would REALLY like some help for these trig equation questions
thank you sooo much if you can helpp me !

if secx - tanx = 3/5, show that sinx = 8/17

if tanx = t, express sin2x and cos2x in terms of t. Find the values for t for which

(k+1)sin2x + (k-1)cos2x = k+1

thankyouuuu againn !!

Originally Posted by iiharthero

hii guyz, i would REALLY like some help for these trig equation questions
thank you sooo much if you can helpp me !

if secx - tanx = 3/5, show that sinx = 8/17

Hi



Square both sides and substitute cos²x with 1-sin²x to find a quadratic in sin x, one of the solutions being "impossible" the other one is the good one

Originally Posted by iiharthero

if tanx = t, express sin2x and cos2x in terms of t. Find the values for t for which

(k+1)sin2x + (k-1)cos2x = k+1