Mathematics, 15.09.2019 19:10 ginareyes0423
1.if cos x+cos y=1, sec x+sec y=4, what is the value of x+y? (the range of x and y are both 0 to 180degree.
2.if sin-1 a=2cos-1 b, find 4b^2(1-b^2).
3.if k is an integer which satisfies the equation 2(sin x)^2+ 10(cos x/2)^2=7-2k then what is the range of k?
4.the question is on the top(fig 1
Answers: 1
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1.if cos x+cos y=1, sec x+sec y=4, what is the value of x+y? (the range of x and y are both 0 to 18...
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