Evaluate
sin? 63°+ sin? 27°
(1) COS? 17° + cos² 739
2
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Answer: 1 , 1
Step-by-step explanation:
Sin² 63° + sin² 27°
⇒sin²63° + sin²(90°-63°) {sin(90°- θ )= cosθ}
⇒sin²63°+ cos²63°= 1 {as sin²θ + cos²θ = 1}
2nd Q
Did you mean cos²17°+ cos²73°
If yes then,
⇒cos²17° + cos²(90°-17°) {as {cos(90°- θ) = sinθ}
⇒ cos²17° + sin²17° = 1 {as sin²θ + cos²θ = 1}
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