If `tan(alpha)`= `a/b` then `cos(2alpha)` is

If tan alpha = n tan beta and sin alpha = m sin beta , then cos^2 alpha is

tan alpha and tan beta are roots of the equation x^(2)+ax+b=0, then the value of sin^(2)(alpha+beta)+a sin(alpha+beta)cos(alpha+beta)+b cos^(2)(alpha+beta) is equal to

tan alpha and tan beta are roots of the equation x^(2)+ax+b=0, then the value of sin^(2)(alpha+beta)+a sin(alpha+beta)*cos(alpha+beta)+b cos^(2)(alpha+beta) is equal to

If cos theta=(a cos alpha+b)/(a+b cos alpha), then the value of tan((theta)/(2)) is :

If tan (alpha+beta)=a+b and tan(alpha-beta)=a-b,thenshowtâtan alpha-b tan beta=a^(2)

If (sin alpha)/(a)=(cos alpha)/(b), then a sin2 alpha+b cos2 alpha=

If cos alpha=(3)/(5), then value of (sin alpha-(1)/(tan alpha))/(2tan alpha) is