Demuestre las siguientes identidades. 1) Cos x Sec x =1 2) Sen x Csc x =1 3) (1 + Cos x)(1 - Cos x) = Sen2 x 4) 1− 2 = csc b 5) 2 + sen y = csc y 6) Tg 2 x cos2 x = 1 – cos2 x 7) csc + = cos y 8) Sec x + tg x = cos 1− 9) 1+ = 1 + csc y 10) 2 − 2 = sen y

Paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each? 1. define a variable for the situation. 2. write an inequality that represents her profit. note: revenue is money coming in. cost is money going out. profit is the difference between the revenue and the cost. in other words: revenue - costs profit 3.using words, describe how many windows she must sell to have a profit of at least $48,000.