If `cot^3alpha+cot^2alpha+cotalpha=1` then (a) `cos2alpha.tanalpha=-1` (b)`cos2alpha.tanalpha=1` (c) `cos2alpha-tan2alpha=1` (d)`cos2alpha-tan2alpha=-1`

For alpha=pi/7 which of the following hold(s) good? (a) tanalphatan2alphatan3alpha=tan3alpha-tan2alpha-tanalpha (b) cos e calpha=cos e c2alpha+cos e c4alpha (c) cosalpha-cos2alpha+cos3alpha=1/2 (d) 8cosalphacos2alphacos4alpha=1

Prove that sin^2alpha-sin^4alpha= cos^2alpha-cos^4alpha

If cot^3 alpha+ cot^2 alpha + cot alpha=1 then which of the following is/are correct

Which of the following identities, wherever defined, hold(s) good? (a) cotalpha-tanalpha=2cot2alpha (b) tan(45^0+alpha)-tan(45^0-alpha)=2cos e c2alpha (c) tan(45^0+alpha)+tan(45^0-alpha)=2sec2alpha (d) tanalpha+cotalpha=2tan2alpha

If cot^(-1)(sqrt(cosalpha))-tan^(-1)(sqrt(cosalpha))=x , then sinx is tan^2alpha/2 (b) cot^2alpha/2 (c) tan^2alpha (d) cotalpha/2

The value of (sin(pi-alpha))/(sin alpha-cos alpha tan.(alpha)/(2))-cos alpha is

prove that : tan(alpha)+2 tan(2alpha) +4(tan4alpha)+8cot(8alpha) = cot(alpha)

IF tan alpha = ( sin alpha - cos alpha )/( sin alpha + cos alpha) , then sin alpha + cos alpha is

Prove that sin4 alpha=4tan alpha (1- tan^(2)alpha)/((1+tan^2 alpha)^2