If `cosA = 1/2` then find value of `cos 3A`

(i) if sin x= (1)/(3) find the value of sin 3x (ii) if cos x= (1)/(2) , find the value of cos 3x

If cosec A =(13)/(12) then find the value of (2 sin A-3 cos A)/(4 sin A-9 cosA)

Evaluate : CosA - SinA = 1 ,then find the value of CosA + SinA

Evaluate : CosA - SinA = 1 ,then find the value of CosA + SinA

If sec A= 2, then find the value of (1)/(cotA)+(cosA)/(1+sinA)

If cosA=4/3 and cosB=12/13 , then find the values of cos(A+B) and sin(A-B) , where (3pi)/(2) lt A, B lt 2pi .

If sinA=cosA,then find the value of sin 2A.

If cosA=7/25 , find the value of tanA+cotA

For A= in (0,pi/4),"if"(1+(cos3A)/(cosA))+(1+(cos6A)/(cos2A))+(1+(cos9A)/(cos3A))+(1+(cos12 A)/(cos4A))=0, then find the value of (csc A - scc 2A).

If cosA+cos^(2)A=1 , then find the value of sin^(12)A+3sin^(10)A+3sin^(8)A+sin^(6)A+sin^(4)A+sin^(2)A .