Q25. Show that:

cos’ (45° + 0)+cos (45°-9

tan (60° + 0) tan (30-0)

=1

# Q25. Show that:

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cos’ (45° + 0)+cos (45°-9

tan (60° + 0) tan (30-0)

=1

Q25. Show that:

cos’ (45° + 0)+cos (45°-9

tan (60° + 0) tan (30-0)

=1

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Step-by-step explanation:We know, 2cos2x=1+cos2x.

∴cos2x=21+cos2x

cos2(455+θ)=21+cos(90o+θ)=21−sinθ

cos2(45o−θ)=21+cos(900−θ)=21+sinθ

tan(60o+θ)=1−tan60otanθtan60o+tanθ=1−3tanθ3+tanθ

tan(30o−θ)=1+tan30otanθtan30o−tanθ=