evaluate sin2 15° + sin2 75°
cos236° + cos2 54°
Answers
Answered by
1
Answer:
1) sin² 15° + sin² 75°
2) cos² 36° + cos² 54°
ans : 1) sin² (15+75)
= sin²(90)
= sin²90
= 1
2) cos²(36+54)
= cos²(90)
= cos²90
= 0
if we add both then 1
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Answered by
1
Answer:
2
Step-by-step explanation:
sin^2 15°+ sin^2 75°+ cos^2 36°+ cos^2 54°
= sin^2 15° + sin^2(90°-15°)+ cos^2 36°+cos^2(90°-36°)
= sin^2 15°+ cos^2 15°+ cos^2 36°+ sin^2 36°
=1+1
= 2
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