What are the solutions of the equation 9x^4-2x^2-7=0? Use u substitution to solve.
1 answer:
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Answer:
284.72
Step-by-step explanation:
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Answer:
-26
Step-by-step explanation:
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Answer:
Step-by-step explanation:
We know that
, because
.
Now, angle 15° or 195° is not an important angle which can be solve by a given table like 30°, 45° or 60°. This means we have to use the calculator to find the more exact value, which is