Introduction to Trigonometry

Trigonometric ratios and basic identities.

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Q1 · Introduction to Trigonometry · EASY
If sin θ = 3/5, then what is the value of cos θ? (Assume θ is an acute angle)
Q2 · Introduction to Trigonometry · EASY
What is the value of (sin 30° + cos 60°)?
Q3 · Introduction to Trigonometry · MEDIUM
If tan A = 1, then what is the value of (sin A × cos A)?
Q4 · Introduction to Trigonometry · HARD
If 5 sin θ = 4, then what is the value of (5 cos θ + 4 tan θ)?
Q5 · Introduction to Trigonometry · EASY
The value of sin 90° is: