Q8 of 54 Page 312

Express each of the following in terms of T-ratios of angles lying between 0° and 45°:
sec 78° + cosec 56°

Consider sec 78° + cosec 56° = sec (90-12)° + cosec (90-34)°

= cosec 12° + sec 34°


More from this chapter

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8

Express each of the following in terms of T-ratios of angles lying between 0° and 45°:

sin 67° + cos 75°

 8

Express each of the following in terms of T-ratios of angles lying between 0° and 45°:
cot 65° + tan 49°

 8

Express each of the following in terms of T-ratios of angles lying between 0° and 45°:
cosec 54° + sin 72°

 9

If A, B and C are the angles of a ABC, prove that