Sin²35. cos²55 - Sin²55. cos²35
Answers
Answered by
1
Answer:
-0.99
Step-by-step explanation:
sin²35 can be written as sin²(90-55)
sin²(90-55) is cos²55.
Similarly, sin²55 is sin²(90-35)
which is cos²35.
Therefore,
(cos²55)²-(sin²55)²
=(cos²55+sin²55)*(cos²55-sin²55)
=cos 110
=-0.99
Answered by
1
Answer:
sin²35.cos²(90-55)-cos²(90-55).cos²35
2sin²35-2cos²35
2
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