Introduction to Trigonometry
RD Sharma
CBSE
Grade 10
Question:
Evaluate: $2 \tan^2 45^\circ + \cos^2 30^\circ - \sin^2 60^\circ$.
Step-by-Step Solution
Key Concept: $2(1)^2 + (\sqrt{3}/2)^2 - (\sqrt{3}/2)^2 = 2 + 3/4 - 3/4 = 2$.
$2(1) + \dfrac{3}{4} - \dfrac{3}{4} = 2$. [2.0 Marks]
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🎯 Official CBSE Marking Scheme:
Substituting values and evaluating $= 2$: 2.0 Marks
Correct Answer:
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