Pls. Solve 1st and 2nd question...
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= sin^2 25°+ sin^2 65° +√3(tan5°tan15°tan30°tan75°tan85°)
= sin^2 25°+ sin^(90°-25°)+√3{tan5°tan(90°-5°)tan15°tan(90°-15°)tan30°}
= sin^2 25°+cos^2 25° +√3(tan5°cot5°tan15°cot15°tan30°)
= 1+√3( tan5°×1/tan5° ×tan15°×1/tan15°×1/√3)
=1+√3×1/√3
=1+1
=2
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