3. Evaluate :
(1)
sin? 63° + sin? 27°
cos? 17° + cos² 73 °
(ii) sin 25° cos 65° + cos 25° sin 65°
Answers
Answered by
9
Answer:
1. 1
2. 1
Step-by-step explanation:
(sin*2 63° + sin*2 27°)/cos*2 17° +cos*2 73°
= [sin*2(90-27)+sin*2 27°]/ cos*2 (90-73) + cos*2 73°
= (cos*2 27° + sin*2 27°)/ sin*2 73° + cos*2 73°
= 1/1
= 1
2. sin 25° cos 65° + cos25° sin 65°
=sin 25° sin(90-25)° + cos 25° cos(90-25)°
= sin*2 25°+ cos*2 25°
=1
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