Simplify sin(90° − θ) − cos θ.

sin(90° − θ) = cos θ, so cos θ − cos θ = 0.

Evaluate cos² 30° + sin² 30°.

(√3/2)² + (½)² = ¾ + ¼ = 1.

tamil-nadu-class-9 · Mathematics

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6 questions10 total marks8m estimated

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EASY2 marks

Write the values of sin 45° and cos 45°.

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