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OpenStudy (anonymous):
In right triangle ABC, ∠A and ∠B are complementary angles and sin A = 89. What is cos B?
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OpenStudy (mathmale):
Please check to ensure you've copied this problem down correctly. Why? because sin A could not possibly equal 89. Do you mean "sin A = 0.89?" The sine function can take on ONLY values between -1 and +1, so sin A = 89 is 'out.'
OpenStudy (mathmale):
Welcome to OpenStudy! Hope you find this learning environment to be very helpful, even fun! What does "complementary" mean in this context?
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