Master Unit 8 Signs of Trigonometric Functions (NBF/FBISE new book 2025-2026) with concise solutions. Aim 90+ marks.
hsanotes.com Features:
- Updated for new book session 2025-2026
- Solved Ex 8.1 + Miscellaneous
- Reference angles calculations
- Trig values in QII
- Sin, cos, tan signs
- Reciprocal functions: cot, sec, csc
- Approximate values examples
- Quadrant rules
Target: FBISE students & affiliated schools – Army Public School, Fazaia Inter College, Beaconhouse, Roots Millennium, The City School, Lahore Grammar School, Karachi Grammar School, OPF Boys/Girls College, Bahria College, PAF College.
Key Solved Examples (short form):
- Ex 8.1 Q1(i) 125° → 55°
- Q1(ii) 138° → 42°
- Q1(iii) 111° → 69°
- Q1(iv) 142° → 38°
- Q2 θ=36° in QII → 144°
- Q3 θ=87° in QII → 93°
- Q4 120° → sin=√3/2, cos=-1/2, tan=-√3
- Q5 3π/4 → cos=-√2/2, sin=√2/2, tan=-1
- Q6 cosθ=0.559 → sinθ≈0.829; 180°-θ: cos≈-0.559, sin≈0.829, tan≈-1.483, cot≈-0.674, sec≈-1.789, csc≈1.206
Useful Links:
- FBISE official: https://www.fbise.edu.pk
- National Book Foundation (NBF): https://www.nbf.org.pk
- Army Public Schools: https://apsacssectt.edu.pk
- Beaconhouse: https://www.beaconhouse.net
View PDF for full solutions, graphs & tables.
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