prove that cos2thita=2cos²thita–1
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1
Answer:
cos
2
θ(1+tan
2
θ)=1
Take L.H.S
cos
2
θ(1+tan
2
θ)
cos
2
θ+cos
2
θ.tan
2
θ
cos
2
θ+cos
2
θ.
cos
2
θ
sin
2
θ
cos
2
θ+sin
2
θ
=1
=R.H.S.
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Answered by
0
Answer:
cos2θ ( 1+tan2θ )=1
Take L.H.S
cos2θ ( 1+tan2θ )
cos2θ+cos2θ .tan2θ
cos2θ+cos2θ .cos2θwithout2i
cos2θ+without2θ
=1
=R.H.S.
Step-by-step explanation:
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