cause we know that the base is more than 1 , we can do this way:
so we can answer it:
x^2_3x-4<0 x is -1 or -4 to make it 0
so after obtaining the signs of equation we can have:
x=(-4,-1)
Answer:
Step-by-step explanation:
Using the difference formula for cosine and the exact values
cos45° = sin45° = , cos30° = , sin30° =
cos(a - b) = cosacosb + sinasinb
Note 15° = 45° - 30°, thus
cos15°
= cos(45 - 30)°
= cos45°cos30° + sin45°sin30°
= ( × ) + ( × )
= +
=
Step-by-step explanation:
<u>Subtract </u><u>15</u><u> </u><u>from</u><u> </u><u>both</u><u> </u><u>sides</u><u>:</u>
<u>Subtract 4x </u><u>from</u><u> both sides:</u>
<u>Divide each side by 6:</u>
Answer:
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