A parabola passes through (7, 42) and has a vertex at (-2, 6). What is the value of a?
1 answer:
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Answer:
Step-by-step explanation:
sin 75°
sin(30°+45°)
sin30°*cos45°+cos30°sin45°
1/2*1/ +
/2*1
1/2+
/2
1+3/2
cos(-75°)
-cos(180°-105°)
-cos(-105°)
cos 105°
cos(45°+60°)
cos45°cos60°-sin45°sin60°
1/ *1/2-1/
*
/2
1/2-
/2
1-/2