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What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Ihave trouble finding the nth term of a linear sequence

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.