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(-2x² - 4x +13) + (12x2 + 2x - 25)

10x^2 -2x -12

Step-by-step explanation:

(-2x² - 4x +13) + (12x^2 + 2x - 25)

Combine like terms

(-2x²  + 12x^2 + 2x - 4x +13- 25)

10x^2 -2x -12

10x²-2x-12

Step-by-step explanation:

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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