`(cos6 0^(@)+1)/(cos6 0^(@)-1)=`

Prove that cos 2 0^(@)cos4 0^(@)cos6 0^(@)cos8 0^(@)=1/16

Value of (1-(cos61^(0))/(cos1^(0)))*(1-(cos62^(0))/(cos2^(0)))*(1-(cos63^(0))/(cos3^(0)))*(1-(cos119^(@))/(cos59^(@)))(1-1(b)1(c)2(d)-2

If (1+ sin6^(@))/( cos 6^(@))=tan A =sqrt((1+ sinB)/(1- sin B)), where A and B in (0,90^(@)) , then

If (1+ sin6^(@))/( cos 6^(@))=tan A =sqrt((1+ sinB)/(1- sin B)), where A and B in (0,90^(@)) , then

If (1+ sin6^(@))/( cos 6^(@))=tan A =sqrt((1+ sinB)/(1- sin B)), where A and B in (0,90^(@)) , then

If x in(0,pi/2) and cos x=1/3, then prove that sum_(n=0)^(oo)(cos nx)/(3^(n))=(3(3-cos x))/(10-6cos x+cos^(2)x)

6cos^(3)x+cos^(2)x-1=0

find the value of sin60^@cos3 0^@+sin3 0^@cos6 0^@

Prove that: sin6^(@)cos42^(0)cos60^(@)quad in78^(0)=(1)/(16)

The value of lim_(xrarr0)((1)/(x^(18)))1-cos((x^(3))/(3))-cos((x^(6))/(6))+cos((x^(3))/(3)).cos((x^(6))/(6))) lambda^(2) , then the value of 900lambda is equal to ("here, "lambda gt 0)