CBSE Class 10-Mathematics: Chapter –8 Introduction to Trigonometry Part 1

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Introduction to Trigonometry

“The mathematician is fascinated with the marvelous beauty of the forms he constructs, and in their beauty he everlasting truth.”

Question 1:

If prove that .

Answer:

Squaring and adding

.

Question 2:

Prove that can never be less than 2.

Answer:

can never be less than 2.

If possible, let it be less than 2.

.

Which is not possible.

Question 3:

If show that

Answer:

Substituting in place of We get .

Question 4:

If , show that

Answer:

If

Question 5:

If , prove that

Answer:

Question 6:

If

Answer:

RHS