Same chapter3 marksDifficulty: Medium
Evaluate 2 tan245° + cos230° − sin260°.
Trigonometrical Ratios of Standard Angles
3 marksDifficulty: Medium
If 2 cos θ = 1 and θ is acute, find θ and the value of sin θ.
Original Khojo Papers practice question — not from a past board paper.
Answer
θ = 60° and sin θ = √3/2
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
cos θ = 1/2 gives θ = 60° for an acute angle.
Related questions
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Write the values of sin 30°, cos 60° and tan 45°.
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