Home
Class 11
MATHS
If costheta=1/2(a+1/a), show that : cos3...

If `costheta=1/2(a+1/a),` show that : `cos3theta=1/2(a^3+1/a^3)`

Promotional Banner

Similar Questions

Explore conceptually related problems

If costheta=1/2(a+1/a) ,show that cos2theta=1/2(a^2+1/a^2)

If costheta= 1/2(a+1/a), show that cos2theta = 1/2*(a^2 + 1/(a^2))

i) Prove that: (1-sin2A)/(1+sin2A) = tan^(2)(pi/4-A) ii) If costheta=1/2(x+1/x) , then prove that: cos2theta=1/2(x^(2)+1/x^(2)) and cos3theta=1/2(x^(3)+1/x^(3))

i) Prove that: (1-sin2A)/(1+sin2A) = tan^(2)(pi/4-A) ii) If costheta=1/2(x+1/x) , then prove that: cos2theta=1/2(x^(2)+1/x^(2)) and cos3theta=1/2(x^(3)+1/x^(3))

IF 2 costheta=x+1/x then show that 2 cos3 theta=x^3+1/x^3

If cos theta=(1)/(2)(a+(1)/(a)) then show that cos3 theta=(1)/(2)(a^(3)+(1)/(a^(3)))

If costheta=1/2(a+1/a) , then the value of cos 3theta is

If 2costheta=x+1/x , prove that 2cos3theta=x^3+1/x^3

If 2costheta=x+(1/x) prove that 2cos3theta=x^3+(1/x^3)

If sintheta=1/2 , show that (3costheta - 4cos^3theta)=0