Question

prove that .........

Answer 1

We use 2 things
1.A plus b whole cube
2. 1+ cot sq.theta=cosec sq. theta

Hope it helps u

Answer 2

R.H.S

cot^6@ + 3cot^[email protected]^2@ + 1,

(cot²@)³ + 3×cot²@.(1+cot²@) + 1³,

1³ + (cot²@)³ + 3×1×cot²@×(1+cot²@),

[since a³+b³+3ab(a+b)=(a+b)³],

(1+cot²@)³,

(cosec²@)³,

[since (1+cot²@)=cosec²@],

cosec^6@,

L.H.S=R.H.S