3 years ago

Factorize the following: cos²B + 5cosB - 6

Mathematics

1 answer:

sp2606 [1]3 years ago

8 0

Answer:

(cosB-1)(cosB+6)

Step-by-step explanation:

use u substitution . u = cosB

u^2+5u-6

factor

(u-1)(u+6)

put cosB back in for u

(cosB-1)(cosB+6)

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