(ii) 5 sin 70° sec 20° - 3 sin 50° sec 40°
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Answered by
10
Answer:
2
Explanation:
5 sin70°sec20°-3sin50°sec40°
=5 sin(90°-20°)sec20°-3sin(90°-40°)sec40°
=5 cos20°sec20°-3cos40°sec40°. [cos 20 sec20= 1]
=5-3
=2
Answered by
1
5 sin70°sec20°-3sin50°sec40°
=5 sin(90°-20°)sec20°-3sin(90°-40°)sec40°
=5 cos20°sec20°-3cos40°sec40°. [cos 20 sec20= 1]
=5-3
=2
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