Question

pls answer the question

prove that
$\frac{cos \: 9x - cos5x}{sin17x - sin3x} = - \frac{sin2x}{cos \: 10x}$
steps are needed

questions from any other websites will be reported​

Answer 1

in an experiment refractive index of glass was observed to be

1.45 ,1.56 ,1.54,1.44,1.54 and 1.53.

CALCULATE :

(i) mean value of refractive index.

(i) mean value of refractive index.(ii) mean absolute error

(i) mean value of refractive index.(ii) mean absolute error(iii) fractional error

(i) mean value of refractive index.(ii) mean absolute error(iii) fractional error(iv) percentage error

(i) mean value of refractive index.(ii) mean absolute error(iii) fractional error(iv) percentage error(v) express the result in terms of absolute error and percentage error.