Q4 of 48 Page 86

Find the values of the following:

(i)


(ii)

(i) ()2 + ()2 – 2.cos 60˚


⇒ ()2 + – 1


⇒ 1 + 1 – 1


= 1


(ii)


⇒


⇒ 12 + 12


= 2.


More from this chapter

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2

Find the values of the following:

(i) cosec 25° – sec 65°


(ii) cot 34° – tan 56°


(iii)


(iv) sin θ cos(90° – θ) + cosθ sin(90° – θ)

 3

Find the values of the following:

(i) sin 70° sin 20° – cos 20° cos 70°


(ii)

5

Find the values of the following:

(i) tan 12° cot 38° cot 52° cot 60° tan 78°


(ii) tan 5° tan 25° tan 30° tan 65° tan 85°

 6

Express the following in terms of the trigonometric ratios of angles between 0° and 45°.

(i) sin 81° + sin 71°


(ii) tan 68° + sec 68°