True and False
Q1: cosA = 4/3 for some angle A.
Q2: tanA = sinA/cosA
Q3: secA = 1cosA, for an acute angle
Q4: sin60º = 2sin30º
Q5: SinA + CosA = 1Short Answer Questions
Q6: Write the values cos 0°, cos 45°, cos 60° and cos 90°. What happens to the values of cos as angle increases from 0° to 90°?
Q7: Write the values of tan 0°,tan 30°, tan 45°, tan 60° and tan 90°. What happens to the values of tan as angle increases from 0° to 90°?
Q8: If cosec A = √10 . find other five trigonometric ratios.
Q9: The value of (sin 30∘ + cos 30∘) − (sin 60∘ + cos 60∘) is
Q10: Evaluate the following: 2sin2 30∘ − 3cos245∘ + tan260∘
Q11: Evaluate:
cot230∘ − 2cos260∘ − 3/ 4sec245∘ − 4sec230∘
Q12: Write the values of sin 0°, sin 30°, sin 45°, sin 60° and sin 90°. What happens to the values of sin as angle increases from 0° to 90°?
Q13: If sin A = 3/5 .find cos A and tan A.
Q14: In a right triangle ABC right angled at B if sinA = 3/5. find all the six trigonometric ratios of C.
Q15: If sinB = 1/2 , show that 3 cosB − 4 cos3B = 0
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