Question

please solve this question step by step​

Answer 1

YOUR QUESTION.:

cosAcotA1−sinA=1+cosecA

I THINK YOU HAVE DONE SOME PRINTING MISTAKE.

Answer for the question:

cosAcotA1−sinA=1+cosecA

Take,

LHS=cosAcotA1−sinA

=cosA(cosAsinA)1−sinA...→[as,cotA=cosAsinA]

=cos2AsinA(1−sinA)...→[where,cos2A=1−sin2A]

=(1−sin2A)sinA(1−sinA)

=(

Answer 2

Answer:-

Let the number of chairs she purchased be n.

Cost of 1 chair =Rs.250

Cost of 1 teble =Rs.400

Now according to the question-

250×x+400×2=2800

250x+800=2800

⇒250x=2800−800

⇒x=

250

2000

=8

Hence the no. of chairs she purchased is 8.

hope it helps ♡

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