1.
Find the general soolution of
cos^2x [1+cos^2x+cos^3x+cos^4x+......cos^7x] = 0 without using arithmetic
or geometric sequence.
2.
In a triangle ABC , by using the cosine law , prove that A^n+B^n is NOT equal to C^n
收錄日期: 2021-04-23 18:03:12
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