Question

Prove that 2cos2ø - 1 = cos2ø - sin2ø.​

Answer 1

Answer:

$cos2θ(1+tan2θ)=1</p><p></p><p>Take L.H.S</p><p></p><p>cos2θ(1+tan2θ)</p><p></p><p>cos2θ+cos2θ.tan2θ</p><p></p><p>cos2θ+cos2θ.cos2θsin2θ</p><p></p><p>cos2θ+sin2θ</p><p></p><p>=1</p><p></p><p>=R.H.S.</p><p></p><p>$