If tanA =n tanB and sinA= m sinB prove that
cos 2 A= m2-1 / n2-1
Answers
Answered by
4
Hope this will help you.....
Attachments:
Sheruu:
cheated from xam idea 10th mathematics
Achha to tum hi bata do doosra tarika.
Babu janta hai 3 months. se maths ka book hath tak nhi lagaye hai.
mujhe kya yaad 3 months se maths ni pdi tene
babu kon
Ha to thik hai n tum hi bata do doosre tarike se banake
kese bheju
Hmko aur kisko
how
Answered by
0
Answer:
Step-by-step explanation:
tanθ+sinθ=m and tanθ-sinθ=n
∴, m²-n²
=(m+n)(m-n)
=(tanθ+sinθ+tanθ-sinθ)(tanθ+sinθ-tanθ+sinθ)
=(2tanθ)(2sinθ)
=4tanθsinθ
4√mn
=4√(tanθ+sinθ)(tanθ-sinθ)
=4√(tan²θ-sin²θ)
=4√{(sin²θ/cos²θ)-sin²θ}
=4√sin²θ{(1/cos²θ)-1}
=4sinθ√{(1-cos²θ)/cos²θ}
=4sinθ√(sin²θ/cos²θ)
=4sinθ√tan²θ
=4sinθtanθ
∴, LHS=RHS (Proved)
Similar questions