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  1. The value of
    sin² 63° + sin² 27°
    		is :
    2
    1. 0
    2. 1
    3. 2
    4. –1
Correct Option: B

sin² 63° + sin² 27°
cos² 17° + cos² 73°

=
sin² 63° + sin² (90° - 63°)
cos² 17° + cos² (90° - 17°)

=
sin² 63° + cos² 63°
cos² 17° + sin² 17°

= 1
∵sin(90° - θ) = cosθ;
cos(90° - θ) = sinθ;
sin²θ + cos² θ = 1


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