Simplify the following expression

Step-by-step explanation:

15 x^2 - 9 + 4 x - 5 x^2 - 11

by grouping the like terms,

15 x^2 - 5 x^2 + 4x - 9 - 11

10 x^2 + 4x - 20

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10x^2+4x-20

Step-by-step explanation:

Subtarct 5x^2 from 15x^2

Subtract 11 from -9

answer: i literally just answered this question but they want me to do it again

step-by-step explanation:

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92