1)IF sinx=cos²x, then cos²x(1 + cos²x) is?

2)SOLUTION SET OF (3/5)^x=(x -x²-9) is?

Dear vardaan

sinx=cos²x

sinx =1-sin²x

sin²x = 1-sinx  ..............1

now   cos²x(1 + cos²x) = sinx (1+sinx)

                                            =sinx + sin²x

                                            = sinx + 1-sinx         from equation (1)

                                             =1

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