Trigonometry Practice Test 1

Question : 34 of 40

Marks: +1, -0

The value of sin50° – sin70° + sin10° is:

Solution:

sin 50° – sin 70° + sin 10°
= 2cos 60° sin (–10)° + sin 10°

= 2 × 1/2 ×

– sin10° + sin 10°
= –sin 10° + sin 10° = 0

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