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Several problems of 2- 1, an elective course in senior high school mathematics.
1. It is known that α is the inner angle of a triangle, and sinα+cosα= 1/5, then the equation x 2sin α-y 2cosα =1represents (b).

A. hyperbola with focus on x axis

B. hyperbola with focus on y axis

C. ellipse with focus on x axis

D. ellipse with focus on y axis

2. As shown in the figure, in the regular pyramid P-ABCD, PA= (√3 /2)AB, E is the midpoint of AB, and G is the center of gravity of△ PCD, then there are (d) straight lines passing through G and perpendicular to PE in the planar PCD.

A.0b.1c.2d. Countless

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